81664381513872

Names of 81664381513872

• Cardinal: 81664381513872 can be written as Eighty-one trillion, six hundred sixty-four billion, three hundred eighty-one million, five hundred thirteen thousand, eight hundred seventy-two.

Scientific notation

• Scientific notation: 8.1664381513872 × 10¹³

Factors of 81664381513872

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 232519243

Divisors of 81664381513872

• Number of divisors d(n): 100
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 36 48 54 72 81 108 144 162 216 271 324 432 542 648 813 1084 1296 1626 2168 2439 3252 4336 4878 6504 7317 9756 13008 14634 19512 21951 29268 39024 43902 58536 87804 117072 175608 351216 232518967 465037934 697556901 930075868 1395113802 1860151736 2092670703 2790227604 3720303472 4185341406 5580455208 6278012109 8370682812 11160910416 12556024218 16741365624 18834036327 25112048436 33482731248 37668072654 50224096872 63012640057 75336145308 100448193744 126025280114 150672290616 189037920171 252050560228 301344581232 378075840342 504101120456 567113760513 756151680684 1008202240912 1134227521026 1512303361368 1701341281539 2268455042052 3024606722736 3402682563078 4536910084104 5104023844617 6805365126156 9073820168208 10208047689234 13610730252312 20416095378468 27221460504624 40832190756936 81664381513872
• Sum of all divisors σ(n): 237232592519296
• Sum of proper divisors (its aliquot sum) s(n): 155568211005424
• 81664381513872 is an abundant number, because the sum of its proper divisors (155568211005424) is greater than itself. Its abundance is 73903829491552

Bases of 81664381513872

• Binary: 10010100100010111111000011100110111000010010000₂
• Hexadecimal: 0x4A45F8737090
• Base-36: SY43K8P00

Squares and roots of 81664381513872

• 81664381513872 squared (81664381513872²) is 6669071208043238850528432384
• 81664381513872 cubed (81664381513872³) is 544625575476822281783151188138460910030848
• The square root of 81664381513872 is 9036834.7065702159
• The cube root of 81664381513872 is 43385.4619264315

Scales and comparisons

• 81,664,381,513,872 seconds is equal to 2,596,674 years, 37 weeks, 5 days, 20 hours, 31 minutes, 12 seconds.
• To count from 1 to 81,664,381,513,872 would take you about six million, four hundred ninety-one thousand, six 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 81664381513872 cubic inches would be around 3615.5 feet tall.

Recreational maths with 81664381513872

• 81664381513872 backwards is 27831518346618
• The number of decimal digits it has is: 14
• The sum of 81664381513872's digits is 63
• More coming soon!