656945968317 has 16 divisors (see below), whose sum is σ = 900448133760. Its totient is φ = 425726165952.

The previous prime is 656945968303. The next prime is 656945968363. The reversal of 656945968317 is 713869549656.

It is not a de Polignac number, because 656945968317 - 2²³ = 656937579709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656945968387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2665842 + ... + 2901827.

It is an arithmetic number, because the mean of its divisors is an integer number (56278008360).

Almost surely, 2^656945968317 is an apocalyptic number.

It is an amenable number.

656945968317 is a deficient number, since it is larger than the sum of its proper divisors (243502165443).

656945968317 is a wasteful number, since it uses less digits than its factorization.

656945968317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568772.

The product of its digits is 293932800, while the sum is 69.

The spelling of 656945968317 in words is "six hundred fifty-six billion, nine hundred forty-five million, nine hundred sixty-eight thousand, three hundred seventeen".