56664917 has 2 divisors, whose sum is σ = 56664918. Its totient is φ = 56664916.

The previous prime is 56664899. The next prime is 56664929. The reversal of 56664917 is 71946665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 7187761 = 7034^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 56664917 - 2⁸ = 56664661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56664947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28332458 + 28332459.

It is an arithmetic number, because the mean of its divisors is an integer number (28332459).

Almost surely, 2^56664917 is an apocalyptic number.

It is an amenable number.

56664917 is a deficient number, since it is larger than the sum of its proper divisors (1).

56664917 is an equidigital number, since it uses as much as digits as its factorization.

56664917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 56664917 is about 7527.6103113804. The cubic root of 56664917 is about 384.0944975948.

The spelling of 56664917 in words is "fifty-six million, six hundred sixty-four thousand, nine hundred seventeen".