661 is a prime number. Like all primes (except two), it is an odd number.
Prime factorization of 661:
See below for interesting mathematical facts about the number 661 from the Numbermatics database.
Names of 661
- Cardinal: 661 can be written as Six hundred sixty-one.
- Scientific notation: 6.61 × 102
Factors of 661
Divisors of 661
Bases of 661
- Binary: 10100101012
- Hexadecimal: 0x295
- Base-36: ID
Squares and roots of 661
Scales and comparisonsHow big is 661?
- 661 seconds is equal to 11 minutes, 1 second.
To count from 1 to 661 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 661 cubic inches would be around 0.7 feet tall.
Recreational maths with 661
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Cite this page
"Number 661 - Facts about the integer". Numbermatics.com. 2022. Web. 1 December 2022.
Numbermatics. (2022). Number 661 - Facts about the integer. Retrieved 1 December 2022, from https://numbermatics.com/n/661/
Numbermatics. 2022. "Number 661 - Facts about the integer". https://numbermatics.com/n/661/
The information we have on file for 661 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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