56664697 has 2 divisors, whose sum is σ = 56664698. Its totient is φ = 56664696.

The previous prime is 56664679. The next prime is 56664703. The reversal of 56664697 is 79646665.

Together with previous prime (56664679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33825856 + 22838841 = 5816^2 + 4779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56664697 is a prime.

It is a super-2 number, since 2×56664697² = 6421775772203618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56664697.

It is not a weakly prime, because it can be changed into another prime (56664667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28332348 + 28332349.

It is an arithmetic number, because the mean of its divisors is an integer number (28332349).

Almost surely, 2^56664697 is an apocalyptic number.

It is an amenable number.

56664697 is a deficient number, since it is larger than the sum of its proper divisors (1).

56664697 is an equidigital number, since it uses as much as digits as its factorization.

56664697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 49.

The square root of 56664697 is about 7527.5956984950. The cubic root of 56664697 is about 384.0940005154.

The spelling of 56664697 in words is "fifty-six million, six hundred sixty-four thousand, six hundred ninety-seven".