1,000,000,000,000,000

Numbers October 2026 1000000000000000 One quadrillion (short scale)One billiard (long scale)One thousand trillionOne million billionOne thousand million million 1000000000000000th (one quadrillionth, short scale) 215 515 256 total peta- M̄̄̄̄ (M with four overlines) Mathematics 1,000,000,000,000,000 ("one quadrillion" on the short scale; "one billiard" on the long scale; one thousand trillion; one million billion) is the natural number following 999,999,999,999,999 and preceding 1,000,000,000,000,001. It is known as 1 padma, 10 lakh arab, 10 crore crore, or 100 nil in the Indian numbering system. Etymology The word quadrillion was created in the 1670s, borrowed from French quadrillion and Italian quadrilione, which is from quadri- ("four") + million ("a thousand thousands"). Originally in British English, the word "quadrillion" referred to million million million millions; however, to many people, the word refers to one thousand trillion (1,000,000,000,000,000) in the present day.Quadrillion - Etymology, Origin & Meaning https://www.etymonline.com/word/quadrillion 2026-05-02 etymonline en-US In mathematics 1,000,000,000,000,000 is written in scientific notation as 1 × 1015 or 1015 (1E+15 or simply 1E15 in E notation). It is a happy number,Lamb Evelyn Happy Numbers Have No Density https://www.scientificamerican.com/blog/roots-of-unity/happy-numbers-have-no-density/ Scientific American 2026-10-15 2019-06-21 harshad number, a cube number (100,0003) and a sursolid number (1,0005). It is also even, composite, abundant, and polite. It is the smallest 16-digit cube number.A061434 a(n) is the smallest n-digit cube Divisors 1,000,000,000,000,000 has a total of 256 divisors (240 even, 16 odd). All divisors are displayed below: 1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1024, 1250, 1280, 1600, 2000, 2048, 2500, 2560, 3125, 3200, 4000, 4096, 5000, 5120, 6250, 6400, 8000, 8192, 10000, 10240, 12500, 12800, 15625, 16000, 16384, 20000, 20480, 25000, 25600, 31250, 32000, 32768, 40000, 40960, 50000, 51200, 62500, 64000, 78125, 80000, 81920, 100000, 102400, 125000, 128000, 156250, 160000, 163840, 200000, 204800, 250000, 256000, 312500, 320000, 390625, 400000, 409600, 500000, 512000, 625000, 640000, 781250, 800000, 819200, 1000000, 1024000, 1250000, 1280000, 1562500, 1600000, 1953125, 2000000, 2048000, 2500000, 2560000, 3125000, 3200000, 3906250, 4000000, 4096000, 5000000, 5120000, 6250000, 6400000, 7812500, 8000000, 9765625, 10000000, 10240000, 12500000, 12800000, 15625000, 16000000, 19531250, 20000000, 20480000, 25000000, 25600000, 31250000, 32000000, 39062500, 40000000, 48828125, 50000000, 51200000, 62500000, 64000000, 78125000, 80000000, 97656250, 100000000, 102400000, 125000000, 128000000, 156250000, 160000000, 195312500, 200000000, 244140625, 250000000, 256000000, 312500000, 320000000, 390625000, 400000000, 488281250, 500000000, 512000000, 625000000, 640000000, 781250000, 800000000, 976562500, 1000000000, 1220703125, 1250000000, 1280000000, 1562500000, 1600000000, 1953125000, 2000000000, 2441406250, 2500000000, 2560000000, 3125000000, 3200000000, 3906250000, 4000000000, 4882812500, 5000000000, 6103515625, 6250000000, 6400000000, 7812500000, 8000000000, 9765625000, 10000000000, 12207031250, 12500000000, 12800000000, 15625000000, 16000000000, 19531250000, 20000000000, 24414062500, 25000000000, 30517578125, 31250000000, 32000000000, 39062500000, 40000000000, 48828125000, 50000000000, 61035156250, 62500000000, 64000000000, 78125000000, 80000000000, 97656250000, 100000000000, 122070312500, 125000000000, 156250000000, 160000000000, 195312500000, 200000000000, 244140625000, 250000000000, 312500000000, 320000000000, 390625000000, 400000000000, 488281250000, 500000000000, 625000000000, 781250000000, 800000000000, 976562500000, 1000000000000, 1250000000000, 1562500000000, 1600000000000, 1953125000000, 2000000000000, 2500000000000, 3125000000000, 3906250000000, 4000000000000, 5000000000000, 6250000000000, 7812500000000, 8000000000000, 10000000000000, 12500000000000, 15625000000000, 20000000000000, 25000000000000, 31250000000000, 40000000000000, 50000000000000, 62500000000000, 100000000000000, 125000000000000, 200000000000000, 250000000000000, 500000000000000, 1000000000000000 Scientific usage For physical quantities, the metric prefix peta- (symbol P) indicates 1,000,000,000,000,000 times the base unit. For example, 1015 bits of data is called a petabit, 1015 joules of energy is called a petajoule, and 1015 watts of power is called a petawatt. Selected 16-digit numbers 1,000,000,000,000,001 to 1,999,999,999,999,999 1,000,000,000,000,037 : smallest 16-digit prime numberA003617 Smallest n-digit prime and Pythagorean primeMcLean Reginald L. Honaker G. 1000000000000037 https://t5k.org/curios/page.php/1000000000000037.html Prime Curios! PrimePages 2026-10-15 1000000000000037 is the smallest 16-digit Pythagorean prime. 1,111,111,111,111,111 : repunitWeisstein Eric W. Repunit https://mathworld.wolfram.com/Repunit.html 2026-10-15 mathworld.wolfram.com Wolfram Research, Inc. enGupta Shyam Sunder Repunit Numbers 2025 Exploring the Beauty of Fascinating Numbers 327–352 Gupta Shyam Sunder https://doi.org/10.1007/978-981-97-2465-9_11 2026-10-15 Singapore Springer Nature 10.1007/978-981-97-2465-9_11 978-981-97-2465-9 1,125,899,906,842,624 = 250, power of twoA000079 Powers of 2: a(n) 2^n 1,583,296,743,997,441 : 45th Cullen numberA002064 Cullen numbers: a(n) n*2^n + 1 2,000,000,000,000,001 to 2,999,999,999,999,999 2,251,799,813,685,248 = 251, power of two 2,357,111,317,192,329 : 10th Smarandache-Wellin numberA019518 Smarandache-Wellin numbers: a(n) is the concatenation of first n primes (written in base 10) 3,000,000,000,000,001 to 3,999,999,999,999,999 3,236,962,232,172,545 : 46th Cullen number 4,000,000,000,000,001 to 4,999,999,999,999,999 4,503,599,627,370,496 = 252, power of two 6,000,000,000,000,001 to 6,999,999,999,999,999 6,614,661,952,700,417 : 47th Cullen number 9,000,000,000,000,001 to 9,999,999,999,999,999 9,007,199,254,740,992 = 253, power of two 9,999,999,999,999,937 : largest 16-digit prime numberA003618 Largest n-digit prime See also Quadrillion Long and short scales Names of large numbers Orders of magnitude (numbers) Power of 10 References 10 Mathematics Category:Integers Category:Large numbers Category:Powers of ten