656316257 has 2 divisors, whose sum is σ = 656316258. Its totient is φ = 656316256.

The previous prime is 656316251. The next prime is 656316329. The reversal of 656316257 is 752613656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541911841 + 114404416 = 23279^2 + 10696^2 .

It is a cyclic number.

It is not a de Polignac number, because 656316257 - 2²⁰ = 655267681 is a prime.

It is not a weakly prime, because it can be changed into another prime (656316251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328158128 + 328158129.

It is an arithmetic number, because the mean of its divisors is an integer number (328158129).

Almost surely, 2^656316257 is an apocalyptic number.

It is an amenable number.

656316257 is a deficient number, since it is larger than the sum of its proper divisors (1).

656316257 is an equidigital number, since it uses as much as digits as its factorization.

656316257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 656316257 is about 25618.6700864819. The cubic root of 656316257 is about 869.0359060911.

The spelling of 656316257 in words is "six hundred fifty-six million, three hundred sixteen thousand, two hundred fifty-seven".