Number 66 is not a prime number. It is a composite number.

A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. We do not consider 66 as a prime number, because it can be written as a product of two smaller natural numbers (check the factors of number 66 below).

Number of factors: 8.

List of factors/divisors: 1, 2, 3, 6, 11, 22, 33, 66.

Parity: 66 is an even number. It means it is divisible by 2 with no remainder.

Perfect square: no (a square number or perfect square is an integer that is the square of an integer).

Perfect number: no, because the sum of its proper divisors is 78 (perfect number is a positive integer that is equal to the sum of its proper divisors).

Number: Prime number: | 59 yes | 60 no | 61 yes | 62 no | 63 no | 64 no | 65 no | 66 no | 67 yes | 68 no | 69 no | 70 no | 71 yes | 72 no | 73 yes |
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