664940762721

Names of 664940762721

• Cardinal: 664940762721 can be written as Six hundred sixty-four billion, nine hundred forty million, seven hundred sixty-two thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 6.64940762721 × 10¹¹

Factors of 664940762721

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 350

Divisors of 664940762721

• Number of divisors d(n): 81
• Complete list of divisors:
  1 3 9 17 51 59 153 177 271 289 531 813 867 1003 2439 2601 3009 3481 4607 9027 10443 13821 15989 17051 31329 41463 47967 51153 59177 73441 78319 143901 153459 177531 220323 234957 271813 532593 660969 704871 815439 943351 1006009 1248497 2446317 2830053 3018027 3745491 4333019 4620821 8490159 9054081 11236473 12999057 13862463 16036967 21224449 38997171 41587389 48110901 63673347 73661323 144332703 191020041 220983969 255648121 272628439 662951907 766944363 817885317 1252242491 2300833089 2453655951 3756727473 4346018057 11270182419 13038054171 39114162513 73882306969 221646920907 664940762721
• Sum of all divisors σ(n): 1041721772403
• Sum of proper divisors (its aliquot sum) s(n): 376781009682
• 664940762721 is a deficient number, because the sum of its proper divisors (376781009682) is less than itself. Its deficiency is 288159753039

Bases of 664940762721

• Binary: 1001101011010001100011101101011001100001₂
• Hexadecimal: 0x9AD18ED661
• Base-36: 8HGWK869

Squares and roots of 664940762721

• 664940762721 squared (664940762721²) is 442146217927985223323841
• 664940762721 cubed (664940762721³) is 294001043383239978647772353323331361
• 664940762721 is a perfect square number. Its square root is 815439
• The cube root of 664940762721 is 8728.2595527033

Scales and comparisons

• 664,940,762,721 seconds is equal to 21,143 years, 3 weeks, 15 hours, 25 minutes, 21 seconds.
• To count from 1 to 664,940,762,721 would take you about forty-two thousand, two 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 664940762721 cubic inches would be around 727.4 feet tall.

Recreational maths with 664940762721

• 664940762721 backwards is 127267049466
• The number of decimal digits it has is: 12
• The sum of 664940762721's digits is 54
• More coming soon!