66562697 has 2 divisors, whose sum is σ = 66562698. Its totient is φ = 66562696.

The previous prime is 66562649. The next prime is 66562723. The reversal of 66562697 is 79626566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34798201 + 31764496 = 5899^2 + 5636^2 .

It is a cyclic number.

It is not a de Polignac number, because 66562697 - 2²⁰ = 65514121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66562637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281348 + 33281349.

It is an arithmetic number, because the mean of its divisors is an integer number (33281349).

Almost surely, 2^66562697 is an apocalyptic number.

It is an amenable number.

66562697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66562697 is an equidigital number, since it uses as much as digits as its factorization.

66562697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 66562697 is about 8158.5965092043. The cubic root of 66562697 is about 405.2692351939.

The spelling of 66562697 in words is "sixty-six million, five hundred sixty-two thousand, six hundred ninety-seven".