256696245317 has 2 divisors, whose sum is σ = 256696245318. Its totient is φ = 256696245316.

The previous prime is 256696245307. The next prime is 256696245359. The reversal of 256696245317 is 713542696652.

256696245317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209172681316 + 47523564001 = 457354^2 + 217999^2 .

It is a cyclic number.

It is not a de Polignac number, because 256696245317 - 2¹⁶ = 256696179781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256696245307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128348122658 + 128348122659.

It is an arithmetic number, because the mean of its divisors is an integer number (128348122659).

Almost surely, 2^256696245317 is an apocalyptic number.

It is an amenable number.

256696245317 is a deficient number, since it is larger than the sum of its proper divisors (1).

256696245317 is an equidigital number, since it uses as much as digits as its factorization.

256696245317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 56.

The spelling of 256696245317 in words is "two hundred fifty-six billion, six hundred ninety-six million, two hundred forty-five thousand, three hundred seventeen".