81555215742

Names of 81555215742

• Cardinal: 81555215742 can be written as Eighty-one billion, five hundred fifty-five million, two hundred fifteen thousand, seven hundred forty-two.

Scientific notation

• Scientific notation: 8.1555215742 × 10¹⁰

Factors of 81555215742

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 3320

Divisors of 81555215742

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 3 6 7 9 11 13 14 18 21 22 26 27 33 39 42 49 54 63 66 67 77 78 91 98 99 117 126 134 143 147 154 182 189 198 201 231 234 273 286 294 297 351 378 402 429 441 462 469 539 546 594 603 637 693 702 737 819 858 871 882 938 1001 1078 1206 1274 1287 1323 1386 1407 1474 1617 1638 1742 1809 1911 2002 2079 2211 2457 2574 2613 2646 2814 3003 3217 3234 3283 3618 3822 3861 4158 4221 4422 4851 4914 5159 5226 5733 6006 6097 6434 6566 6633 7007 7722 7839 8442 9009 9581 9651 9702 9849 10318 11466 12194 12663 13266 14014 14553 15477 15678 17199 18018 18291 19162 19302 19698 19899 21021 22519 23517 25326 27027 28743 28953 29106 29547 30954 34398 35387 36113 36582 39798 41821 42042 42679 45038 46431 47034 54054 54873 57486 57906 59094 63063 67067 67557 70774 72226 83642 85358 86229 86859 88641 92862 106161 108339 109746 125463 126126 128037 134134 135114 139293 157633 164619 172458 173718 177282 189189 201201 202671 212322 215539 216678 247709 250926 256074 258687 278586 292747 315266 318483 325017 329238 376389 378378 384111 402402 405342 431078 460031 469469 472899 495418 517374 585494 603603 608013 636966 646617 650034 743127 752778 768222 878241 920062 938938 945798 955449 975051 1129167 1152333 1207206 1216026 1293234 1380093 1408407 1418697 1486254 1508773 1733963 1756482 1810809 1910898 1939851 1950102 2049229 2229381 2258334 2304666 2370929 2634723 2760186 2802007 2816814 2837394 3017546 3220217 3467926 3621618 3879702 4098458 4140279 4225221 4256091 4458762 4526319 4741858 5201889 5269446 5604014 5819553 6147687 6440434 6688143 7112787 7904169 8280558 8406021 8450442 8512182 9052638 9660651 10403778 10561411 11639106 12295374 12420837 12675663 13376286 13578957 14225574 15605667 15808338 16596503 16812042 18443061 19321302 19614049 21122822 21338361 22541519 24841674 25218063 25351326 27157914 28981953 30822077 31211334 31684233 33193006 36886122 39228098 40736871 42676722 45083038 46817001 49789509 50436126 55329183 57963906 58842147 61644154 63368466 64015083 67624557 75654189 81473742 86945859 92466231 93634002 95052699 99579018 110658366 116175521 117684294 128030166 135249114 137298343 149368527 151308378 173891718 176526441 184932462 190105398 202873671 215754539 232351042 274596686 277398693 285158097 298737054 348526563 353052882 405747342 411895029 431509078 448105581 529579323 554797386 570316194 608621013 647263617 697053126 823790058 832196079 896211162 1045579689 1059158646 1217242026 1235685087 1294527234 1510281773 1664392158 1941790851 2091159378 2471370174 3020563546 3136739067 3707055261 3883581702 4530845319 5825372553 6273478134 7414110522 9061690638 11650745106 13592535957 27185071914 40777607871 81555215742
• Sum of all divisors σ(n): 251455034880
• Sum of proper divisors (its aliquot sum) s(n): 169899819138
• 81555215742 is an abundant number, because the sum of its proper divisors (169899819138) is greater than itself. Its abundance is 88344603396

Bases of 81555215742

• Binary: 1001011111101000100011101010101111110₂
• Hexadecimal: 0x12FD11D57E
• Base-36: 11GRVB7I

Squares and roots of 81555215742

• 81555215742 squared (81555215742²) is 6651253214724164610564
• 81555215742 cubed (81555215742³) is 542444390881500295835268432298488
• The square root of 81555215742 is 285578.7382526927
• The cube root of 81555215742 is 4336.6121306065

Scales and comparisons

• 81,555,215,742 seconds is equal to 2,593 years, 10 weeks, 4 days, 2 hours, 35 minutes, 42 seconds.
• To count from 1 to 81,555,215,742 would take you about five thousand, one hundred eighty-six years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 81555215742 cubic inches would be around 361.4 feet tall.

Recreational maths with 81555215742

• 81555215742 backwards is 24751255518
• The number of decimal digits it has is: 11
• The sum of 81555215742's digits is 45
• More coming soon!