656117617 has 2 divisors, whose sum is σ = 656117618. Its totient is φ = 656117616.

The previous prime is 656117597. The next prime is 656117639. The reversal of 656117617 is 716711656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558424161 + 97693456 = 23631^2 + 9884^2 .

It is a cyclic number.

It is not a de Polignac number, because 656117617 - 2¹¹ = 656115569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656117617.

It is not a weakly prime, because it can be changed into another prime (656117677) 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, 328058808 + 328058809.

It is an arithmetic number, because the mean of its divisors is an integer number (328058809).

Almost surely, 2^656117617 is an apocalyptic number.

It is an amenable number.

656117617 is a deficient number, since it is larger than the sum of its proper divisors (1).

656117617 is an equidigital number, since it uses as much as digits as its factorization.

656117617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 656117617 is about 25614.7929329909. The cubic root of 656117617 is about 868.9482234081.

The spelling of 656117617 in words is "six hundred fifty-six million, one hundred seventeen thousand, six hundred seventeen".