81551131320

Names of 81551131320

• Cardinal: 81551131320 can be written as Eighty-one billion, five hundred fifty-one million, one hundred thirty-one thousand, three hundred twenty.

Scientific notation

• Scientific notation: 8.155113132 × 10¹⁰

Factors of 81551131320

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 340

Divisors of 81551131320

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 131 199 262 393 398 524 597 655 786 796 995 1048 1194 1310 1572 1592 1965 1990 2388 2620 2985 3144 3930 3980 4776 5240 5970 7860 7960 11940 15720 17161 23880 26069 34322 39601 51483 52138 68644 78207 79202 85805 102966 104276 118803 130345 137288 156414 158404 171610 198005 205932 208552 237606 257415 260690 312828 316808 343220 391035 396010 411864 475212 514830 521380 594015 625656 686440 782070 792020 950424 1029660 1042760 1188030 1564140 1584040 2059320 2376060 3128280 3415039 4752120 5187731 6830078 10245117 10375462 13660156 15563193 17075195 20490234 20750924 25938655 27320312 31126386 34150390 40980468 41501848 51225585 51877310 62252772 68300780 77815965 81960936 102451170 103754620 124505544 136601560 155631930 204902340 207509240 311263860 409804680 622527720 679592761 1359185522 2038778283 2718371044 3397963805 4077556566 5436742088 6795927610 8155113132 10193891415 13591855220 16310226264 20387782830 27183710440 40775565660 81551131320
• Sum of all divisors σ(n): 247780329480
• Sum of proper divisors (its aliquot sum) s(n): 166229198160
• 81551131320 is an abundant number, because the sum of its proper divisors (166229198160) is greater than itself. Its abundance is 84678066840

Bases of 81551131320

• Binary: 1001011111100110100111000001010111000₂
• Hexadecimal: 0x12FCD382B8
• Base-36: 11GPFRNC

Squares and roots of 81551131320

• 81551131320 squared (81551131320²) is 6650587019571884942400
• 81551131320 cubed (81551131320³) is 542362895388194199117593035968000
• The square root of 81551131320 is 285571.5870320435
• The cube root of 81551131320 is 4336.5397344615

Scales and comparisons

• 81,551,131,320 seconds is equal to 2,593 years, 3 weeks, 5 days, 20 hours, 2 minutes.
• To count from 1 to 81,551,131,320 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 81551131320 cubic inches would be around 361.4 feet tall.

Recreational maths with 81551131320

• 81551131320 backwards is 02313115518
• 81551131320 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81551131320's digits is 30
• More coming soon!