66

Names of 66

• Cardinal: 66 can be written as Sixty-six.

Scientific notation

• Scientific notation: 6.6 × 10¹

Factors of 66

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 16

Divisors of 66

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 3 6 11 22 33 66
• Sum of all divisors σ(n): 144
• Sum of proper divisors (its aliquot sum) s(n): 78
• 66 is an abundant number, because the sum of its proper divisors (78) is greater than itself. Its abundance is 12

Bases of 66

• Binary: 1000010₂
• Hexadecimal: 0x42
• Base-36: 1U

Squares and roots of 66

• 66 squared (66²) is 4356
• 66 cubed (66³) is 287496
• The square root of 66 is 8.1240384047
• The cube root of 66 is 4.0412400207

Scales and comparisons

• 66 seconds is equal to 1 minute, 6 seconds.
• To count from 1 to 66 would take you about thirty-three seconds.

  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 66 cubic inches would be around 0.3 feet tall.

Recreational maths with 66

• 66 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 2
• The sum of 66's digits is 12
• More coming soon!