656897117 has 2 divisors, whose sum is σ = 656897118. Its totient is φ = 656897116.

The previous prime is 656897083. The next prime is 656897147. The reversal of 656897117 is 711798656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655667236 + 1229881 = 25606^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 656897117 - 2²⁰ = 655848541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656897147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328448558 + 328448559.

It is an arithmetic number, because the mean of its divisors is an integer number (328448559).

Almost surely, 2^656897117 is an apocalyptic number.

It is an amenable number.

656897117 is a deficient number, since it is larger than the sum of its proper divisors (1).

656897117 is an equidigital number, since it uses as much as digits as its factorization.

656897117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 656897117 is about 25630.0042333200. The cubic root of 656897117 is about 869.2922049645.

The spelling of 656897117 in words is "six hundred fifty-six million, eight hundred ninety-seven thousand, one hundred seventeen".