81991086930180

Names of 81991086930180

• Cardinal: 81991086930180 can be written as Eighty-one trillion, nine hundred ninety-one billion, eighty-six million, nine hundred thirty thousand, one hundred eighty.

Scientific notation

• Scientific notation: 8.199108693018 × 10¹³

Factors of 81991086930180

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 42329579

Divisors of 81991086930180

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 17 18 20 27 30 34 36 45 51 54 60 68 85 90 102 108 135 153 170 180 204 211 255 270 306 340 422 459 510 540 612 633 765 844 918 1020 1055 1266 1530 1836 1899 2110 2295 2532 3060 3165 3587 3798 4220 4590 5697 6330 7174 7596 9180 9495 10761 11394 12660 14348 17935 18990 21522 22788 28485 32283 35870 37980 43044 53805 56970 64566 71740 96849 107610 113940 129132 161415 193698 215220 322830 387396 484245 645660 968490 1936980 42329341 84658682 126988023 169317364 211646705 253976046 380964069 423293410 507952092 634940115 719598797 761928138 846586820 1142892207 1269880230 1439197594 1523856276 1904820345 2158796391 2285784414 2539760460 2878395188 3597993985 3809640690 4317592782 4571568828 5714461035 6476389173 7195987970 7619281380 8635185564 8931490951 10793981955 11428922070 12952778346 14391975940 17862981902 19429167519 21587963910 22857844140 25905556692 26794472853 32381945865 35725963804 38858335038 43175927820 44657454755 53588945706 64763891730 77716670076 80383418559 89314909510 97145837595 107177891412 129527783460 133972364265 151835346167 160766837118 178629819020 194291675190 241150255677 267944728530 303670692334 321533674236 388583350380 401917092795 455506038501 482300511354 535889457060 607341384668 759176730835 803834185590 911012077002 964601022708 1205751278385 1366518115503 1518353461670 1607668371180 1822024154004 2277530192505 2411502556770 2733036231006 3036706923340 4099554346509 4555060385010 4823005113540 5466072462012 6832590577515 8199108693018 9110120770020 13665181155030 16398217386036 20497771732545 27330362310060 40995543465090 81991086930180
• Sum of all divisors σ(n): 271368332040960
• Sum of proper divisors (its aliquot sum) s(n): 189377245110780
• 81991086930180 is an abundant number, because the sum of its proper divisors (189377245110780) is greater than itself. Its abundance is 107386158180600

Bases of 81991086930180

• Binary: 10010101001001000001001100111000111100100000100₂
• Hexadecimal: 0x4A92099C7904
• Base-36: T2A6O7LL0

Squares and roots of 81991086930180

• 81991086930180 squared (81991086930180²) is 6722538335992333616194832400
• 81991086930180 cubed (81991086930180³) is 551188225097815030239470379176095601832000
• The square root of 81991086930180 is 9054892.9828121107
• The cube root of 81991086930180 is 43443.2407085033

Scales and comparisons

• 81,991,086,930,180 seconds is equal to 2,607,062 years, 49 weeks, 2 days, 13 hours, 3 minutes.
• To count from 1 to 81,991,086,930,180 would take you about six million, five hundred seventeen thousand, six hundred fifty-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 81991086930180 cubic inches would be around 3620.3 feet tall.

Recreational maths with 81991086930180

• 81991086930180 backwards is 08103968019918
• The number of decimal digits it has is: 14
• The sum of 81991086930180's digits is 63
• More coming soon!