81215136951669216

Names of 81215136951669216

• Cardinal: 81215136951669216 can be written as Eighty-one quadrillion, two hundred fifteen trillion, one hundred thirty-six billion, nine hundred fifty-one million, six hundred sixty-nine thousand, two hundred sixteen.

Scientific notation

• Scientific notation: 8.1215136951669216 × 10¹⁶

Factors of 81215136951669216

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 93999001101474

Divisors of 81215136951669216

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 32 36 48 54 72 96 108 144 216 288 432 864 93999001101469 187998002202938 281997003304407 375996004405876 563994006608814 751992008811752 845991009913221 1127988013217628 1503984017623504 1691982019826442 2255976026435256 2537973029739663 3007968035247008 3383964039652884 4511952052870512 5075946059479326 6767928079305768 9023904105741024 10151892118958652 13535856158611536 20303784237917304 27071712317223072 40607568475834608 81215136951669216
• Sum of all divisors σ(n): 236877482775704400
• Sum of proper divisors (its aliquot sum) s(n): 155662345824035184
• 81215136951669216 is an abundant number, because the sum of its proper divisors (155662345824035184) is greater than itself. Its abundance is 74447208872365968

Bases of 81215136951669216

• Binary: 100100000100010001011110010011100011000111001000111100000₂
• Hexadecimal: 0x12088BC9C6391E0
• Base-36: M7OD2UKBSO0

Squares and roots of 81215136951669216

• 81215136951669216 squared (81215136951669216²) is 6595898470078386514581048682054656
• 81215136951669216 cubed (81215136951669216³) is 535686797566721617277363404612008814182003744669696
• The square root of 81215136951669216 is 284982695.8811169925
• The cube root of 81215136951669216 is 433057.5956320309

Scales and comparisons

• 81,215,136,951,669,216 seconds is equal to 2,582,390,140 years, 7 weeks, 5 days, 16 hours, 33 minutes, 36 seconds.
• To count from 1 to 81,215,136,951,669,216 would take you about seven billion, seven hundred forty-seven million, one hundred seventy thousand, four hundred twenty 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 81215136951669216 cubic inches would be around 36088.1 feet tall.

Recreational maths with 81215136951669216

• 81215136951669216 backwards is 61296615963151218
• 81215136951669216 is a Harshad number.
• The number of decimal digits it has is: 17
• The sum of 81215136951669216's digits is 72
• More coming soon!