1665

Names of 1665

• Cardinal: 1665 can be written as One thousand, six hundred sixty-five.

Scientific notation

• Scientific notation: 1.665 × 10³

Factors of 1665

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 45

Divisors of 1665

• Number of divisors d(n): 12
• Complete list of divisors:
  1 3 5 9 15 37 45 111 185 333 555 1665
• Sum of all divisors σ(n): 2964
• Sum of proper divisors (its aliquot sum) s(n): 1299
• 1665 is a deficient number, because the sum of its proper divisors (1299) is less than itself. Its deficiency is 366

Bases of 1665

• Binary: 11010000001₂
• Hexadecimal: 0x681
• Base-36: 1A9

Squares and roots of 1665

• 1665 squared (1665²) is 2772225
• 1665 cubed (1665³) is 4615754625
• The square root of 1665 is 40.8044115261
• The cube root of 1665 is 11.8523575931

Scales and comparisons

• 1,665 seconds is equal to 27 minutes, 45 seconds.
• To count from 1 to 1,665 would take you about twenty-seven minutes.

  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 1665 cubic inches would be around 1 feet tall.

Recreational maths with 1665

• 1665 backwards is 5661
• The number of decimal digits it has is: 4
• The sum of 1665's digits is 18
• More coming soon!