81664864421840

Names of 81664864421840

• Cardinal: 81664864421840 can be written as Eighty-one trillion, six hundred sixty-four billion, eight hundred sixty-four million, four hundred twenty-one thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.166486442184 × 10¹³

Factors of 81664864421840

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 20832873591

Divisors of 81664864421840

• Number of divisors d(n): 60
• Complete list of divisors:
  1 2 4 5 7 8 10 14 16 20 28 35 40 49 56 70 80 98 112 140 196 245 280 392 490 560 784 980 1960 3920 20832873577 41665747154 83331494308 104164367885 145830115039 166662988616 208328735770 291660230078 333325977232 416657471540 583320460156 729150575195 833314943080 1020810805273 1166640920312 1458301150390 1666629886160 2041621610546 2333281840624 2916602300780 4083243221092 5104054026365 5833204601560 8166486442184 10208108052730 11666409203120 16332972884368 20416216105460 40832432210920 81664864421840
• Sum of all divisors σ(n): 220870125673956
• Sum of proper divisors (its aliquot sum) s(n): 139205261252116
• 81664864421840 is an abundant number, because the sum of its proper divisors (139205261252116) is greater than itself. Its abundance is 57540396830276

Bases of 81664864421840

• Binary: 10010100100011000010101001111000000011111010000₂
• Hexadecimal: 0x4A46153C07D0
• Base-36: SY4BJR368

Squares and roots of 81664864421840

• 81664864421840 squared (81664864421840²) is 6669150081037508637468985600
• 81664864421840 cubed (81664864421840³) is 544635237176831391962592656871875285504000
• The square root of 81664864421840 is 9036861.4253976475
• The cube root of 81664864421840 is 43385.5474436977

Scales and comparisons

• 81,664,864,421,840 seconds is equal to 2,596,690 years, 4 weeks, 2 days, 1 hour, 37 minutes, 20 seconds.
• To count from 1 to 81,664,864,421,840 would take you about six million, four hundred ninety-one thousand, seven hundred twenty-five 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 81664864421840 cubic inches would be around 3615.5 feet tall.

Recreational maths with 81664864421840

• 81664864421840 backwards is 04812446846618
• The number of decimal digits it has is: 14
• The sum of 81664864421840's digits is 62
• More coming soon!