81165749042

Names of 81165749042

• Cardinal: 81165749042 can be written as Eighty-one billion, one hundred sixty-five million, seven hundred forty-nine thousand and forty-two.

Scientific notation

• Scientific notation: 8.1165749042 × 10¹⁰

Factors of 81165749042

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 924

Divisors of 81165749042

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 7 14 17 34 49 98 119 238 281 562 617 833 1234 1666 1967 3934 4319 4777 8638 9554 10489 13769 20978 27538 30233 33439 60466 66878 73423 78961 146846 157922 173377 234073 346754 468146 513961 552727 1027922 1105454 1213639 1342337 2427278 2684674 2947409 3869089 5894818 7738178 8495473 9396359 16990946 18792718 20631863 41263726 48718937 65774513 97437874 131549026 144423041 288846082 341032559 682065118 828221929 1656443858 2387227913 4774455826 5797553503 11595107006 40582874521 81165749042
• Sum of all divisors σ(n): 150736351572
• Sum of proper divisors (its aliquot sum) s(n): 69570602530
• 81165749042 is a deficient number, because the sum of its proper divisors (69570602530) is less than itself. Its deficiency is 11595146512

Bases of 81165749042

• Binary: 1001011100101110110110000101100110010₂
• Hexadecimal: 0x12E5DB0B32
• Base-36: 11ABZOS2

Squares and roots of 81165749042

• 81165749042 squared (81165749042²) is 6587878817548923917764
• 81165749042 cubed (81165749042³) is 534710118824283664266384269782088
• The square root of 81165749042 is 284896.0319871093
• The cube root of 81165749042 is 4329.6979530695

Scales and comparisons

• 81,165,749,042 seconds is equal to 2,580 years, 42 weeks, 4 days, 9 hours, 24 minutes, 2 seconds.
• To count from 1 to 81,165,749,042 would take you about five thousand, one hundred sixty-one 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 81165749042 cubic inches would be around 360.8 feet tall.

Recreational maths with 81165749042

• 81165749042 backwards is 24094756118
• The number of decimal digits it has is: 11
• The sum of 81165749042's digits is 47
• More coming soon!