56664997 has 2 divisors, whose sum is σ = 56664998. Its totient is φ = 56664996.

The previous prime is 56664989. The next prime is 56665027. The reversal of 56664997 is 79946665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43480836 + 13184161 = 6594^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 56664997 - 2³ = 56664989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56664917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28332498 + 28332499.

It is an arithmetic number, because the mean of its divisors is an integer number (28332499).

Almost surely, 2^56664997 is an apocalyptic number.

It is an amenable number.

56664997 is a deficient number, since it is larger than the sum of its proper divisors (1).

56664997 is an equidigital number, since it uses as much as digits as its factorization.

56664997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 52.

The square root of 56664997 is about 7527.6156251498. The cubic root of 56664997 is about 384.0946783507.

The spelling of 56664997 in words is "fifty-six million, six hundred sixty-four thousand, nine hundred ninety-seven".