665

665 is an odd composite number composed of three prime numbers multiplied together.

What does the number 665 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

665 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 665:

5 × 7 × 19

See below for interesting mathematical facts about the number 665 from the Numbermatics database.


Names of 665

  • Cardinal: 665 can be written as Six hundred sixty-five.

Scientific notation

  • Scientific notation: 6.65 × 102

Factors of 665

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 31

Divisors of 665

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 960
  • Sum of proper divisors (its aliquot sum) s(n): 295
  • 665 is a deficient number, because the sum of its proper divisors (295) is less than itself. Its deficiency is 370

Bases of 665

  • Binary: 10100110012
  • Hexadecimal: 0x299
  • Base-36: IH

Squares and roots of 665

  • 665 squared (6652) is 442225
  • 665 cubed (6653) is 294079625
  • The square root of 665 is 25.7875939165
  • The cube root of 665 is 8.7285187351

Scales and comparisons

How big is 665?
  • 665 seconds is equal to 11 minutes, 5 seconds.
  • To count from 1 to 665 would take you about five 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 665 cubic inches would be around 0.7 feet tall.

Recreational maths with 665

  • 665 backwards is 566
  • The number of decimal digits it has is: 3
  • The sum of 665's digits is 17
  • More coming soon!

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The information we have on file for 665 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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