1661

1,661 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1661 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

1661 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 1661:

11 × 151

See below for interesting mathematical facts about the number 1661 from the Numbermatics database.


Names of 1661

  • Cardinal: 1661 can be written as One thousand, six hundred sixty-one.

Scientific notation

  • Scientific notation: 1.661 × 103

Factors of 1661

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 162

Divisors of 1661

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 1824
  • Sum of proper divisors (its aliquot sum) s(n): 163
  • 1661 is a deficient number, because the sum of its proper divisors (163) is less than itself. Its deficiency is 1498

Bases of 1661

  • Binary: 110011111012
  • Hexadecimal: 0x67D
  • Base-36: 1A5

Squares and roots of 1661

  • 1661 squared (16612) is 2758921
  • 1661 cubed (16613) is 4582567781
  • The square root of 1661 is 40.7553677447
  • The cube root of 1661 is 11.8428586047

Scales and comparisons

How big is 1661?
  • 1,661 seconds is equal to 27 minutes, 41 seconds.
  • To count from 1 to 1,661 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 1661 cubic inches would be around 1 feet tall.

Recreational maths with 1661

  • 1661 is the same when its digits are reversed! That makes it a palindromic number.
  • The number of decimal digits it has is: 4
  • The sum of 1661's digits is 14
  • More coming soon!

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"Number 1661 - Facts about the integer". Numbermatics.com. 2020. Web. 4 July 2020.

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Numbermatics. (2020). Number 1661 - Facts about the integer. Retrieved 4 July 2020, from https://numbermatics.com/n/1661/

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The information we have on file for 1661 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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