81818721946415868

Names of 81818721946415868

• Cardinal: 81818721946415868 can be written as Eighty-one quadrillion, eight hundred eighteen trillion, seven hundred twenty-one billion, nine hundred forty-six million, four hundred fifteen thousand, eight hundred sixty-eight.

Scientific notation

• Scientific notation: 8.1818721946415868 × 10¹⁶

Factors of 81818721946415868

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 155570

Divisors of 81818721946415868

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 6 12 19 38 57 76 114 228 349 613 698 1047 1226 1396 1839 2094 2452 3678 4188 6631 7356 11647 11743 13262 19893 23294 23486 26524 34941 35229 39786 46588 46972 69882 70458 79572 139764 140916 142841 213937 223117 285682 427874 428523 446234 571364 641811 669351 855748 857046 892468 1283622 1338702 1714092 2567244 2677404 2713979 4064803 4098307 5427958 7198459 8129606 8141937 8196614 10855916 12194409 12294921 14396918 16259212 16283874 16393228 21595377 24388818 24589842 28793836 32567748 43190754 48777636 49179684 49851509 77867833 86381508 87561533 99703018 136770721 149554527 155735666 175123066 199406036 233603499 262684599 273541442 299109054 311471332 350246132 410312163 467206998 525369198 547082884 598218108 820624326 934413996 947178671 1050738396 1641248652 1663669127 1677381863 1894357342 2512262191 2841536013 3327338254 3354763726 3788714684 4991007381 5024524382 5032145589 5683072026 6654676508 6709527452 7536786573 9982014762 10049048764 10064291178 11366144052 15073573146 19964029524 20128582356 30147146292 30558975017 31870255397 47732981629 61117950034 63740510794 91676925051 95465963258 95610766191 122235900068 127481021588 143198944887 183353850102 190931926516 191221532382 286397889774 366707700204 382443064764 572795779548 580620525323 585406270187 1028235082019 1161241050646 1170812540374 1741861575969 1756218810561 2056470164038 2322482101292 2341625080748 3084705246057 3483723151938 3512437621122 4112940328076 6169410492114 6967446303876 7024875242244 11122719133553 12338820984228 19536466558361 22245438267106 33368157400659 39072933116722 44490876534212 58609399675083 66736314801318 78145866233444 117218799350166 133472629602636 234437598700332 358854043624631 717708087249262 1076562130873893 1435416174498524 2153124261747786 4306248523495572 6818226828867989 13636453657735978 20454680486603967 27272907315471956 40909360973207934 81818721946415868
• Sum of all divisors σ(n): 201881446298112000
• Sum of proper divisors (its aliquot sum) s(n): 120062724351696132
• 81818721946415868 is an abundant number, because the sum of its proper divisors (120062724351696132) is greater than itself. Its abundance is 38244002405280264

Bases of 81818721946415868

• Binary: 100100010101011011011000110110001100101111011001011111100₂
• Hexadecimal: 0x122ADB1B197B2FC
• Base-36: MDMBDYU3HTO

Squares and roots of 81818721946415868

• 81818721946415868 squared (81818721946415868²) is 6694303260944913603432651202193424
• 81818721946415868 cubed (81818721946415868³) is 547719337132236913850771639180298713355836878852032
• The square root of 81818721946415868 is 286039720.9242378421
• The cube root of 81818721946415868 is 434127.7663753053

Scales and comparisons

• 81,818,721,946,415,868 seconds is equal to 2,601,582,275 years, 50 weeks, 3 days, 21 hours, 17 minutes, 48 seconds.
• To count from 1 to 81,818,721,946,415,868 would take you about seven billion, eight hundred four million, seven hundred forty-six thousand, eight hundred twenty-seven 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 81818721946415868 cubic inches would be around 36177.3 feet tall.

Recreational maths with 81818721946415868

• 81818721946415868 backwards is 86851464912781818
• The number of decimal digits it has is: 17
• The sum of 81818721946415868's digits is 87
• More coming soon!