18157178221

Names of 18157178221

• Cardinal: 18157178221 can be written as Eighteen billion, one hundred fifty-seven million, one hundred seventy-eight thousand, two hundred twenty-one.

Scientific notation

• Scientific notation: 1.8157178221 × 10¹⁰

Factors of 18157178221

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 858

Divisors of 18157178221

• Number of divisors d(n): 64
• Complete list of divisors:
  1 7 13 19 79 91 133 247 307 433 553 1027 1501 1729 2149 3031 3991 5629 5833 7189 8227 10507 19513 24253 27937 34207 39403 40831 57589 75829 106951 132931 136591 169771 239449 315289 444691 460807 530803 649933 748657 930517 1728103 2207023 2525689 3112837 3225649 4549531 5990491 8449129 10501549 12096721 17679823 32833957 41933437 59143903 73510843 136520137 199529431 229837699 955640959 1396706017 2593882603 18157178221
• Sum of all divisors σ(n): 23954022400
• Sum of proper divisors (its aliquot sum) s(n): 5796844179
• 18157178221 is a deficient number, because the sum of its proper divisors (5796844179) is less than itself. Its deficiency is 12360334042

Bases of 18157178221

• Binary: 10000111010010000001000110101101101₂
• Hexadecimal: 0x43A408D6D
• Base-36: 8CABCDP

Squares and roots of 18157178221

• 18157178221 squared (18157178221²) is 329683120949156724841
• 18157178221 cubed (18157178221³) is 5986115183529337332598694887861
• The square root of 18157178221 is 134748.5740963517
• The cube root of 18157178221 is 2628.3475102099

Scales and comparisons

• 18,157,178,221 seconds is equal to 577 years, 17 weeks, 5 days, 12 hours, 37 minutes, 1 second.
• To count from 1 to 18,157,178,221 would take you about one thousand, one hundred fifty-four 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 18157178221 cubic inches would be around 219 feet tall.

Recreational maths with 18157178221

• 18157178221 backwards is 12287175181
• The number of decimal digits it has is: 11
• The sum of 18157178221's digits is 43
• More coming soon!