256255804957 has 2 divisors, whose sum is σ = 256255804958. Its totient is φ = 256255804956.

The previous prime is 256255804867. The next prime is 256255804967. The reversal of 256255804957 is 759408552652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234818745561 + 21437059396 = 484581^2 + 146414^2 .

It is a cyclic number.

It is not a de Polignac number, because 256255804957 - 2⁷ = 256255804829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256255804967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128127902478 + 128127902479.

It is an arithmetic number, because the mean of its divisors is an integer number (128127902479).

Almost surely, 2^256255804957 is an apocalyptic number.

It is an amenable number.

256255804957 is a deficient number, since it is larger than the sum of its proper divisors (1).

256255804957 is an equidigital number, since it uses as much as digits as its factorization.

256255804957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240000, while the sum is 58.

The spelling of 256255804957 in words is "two hundred fifty-six billion, two hundred fifty-five million, eight hundred four thousand, nine hundred fifty-seven".