256177317325 has 6 divisors (see below), whose sum is σ = 317659873514. Its totient is φ = 204941853840.

The previous prime is 256177317301. The next prime is 256177317329. The reversal of 256177317325 is 523713771652.

It can be written as a sum of positive squares in 3 ways, for example, as 37066260676 + 219111056649 = 192526^2 + 468093^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256177317325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256177317329) 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 5 ways as a sum of consecutive naturals, for example, 5123546322 + ... + 5123546371.

Almost surely, 2^256177317325 is an apocalyptic number.

256177317325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256177317325 is a deficient number, since it is larger than the sum of its proper divisors (61482556189).

256177317325 is a wasteful number, since it uses less digits than its factorization.

256177317325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247092703 (or 10247092698 counting only the distinct ones).

The product of its digits is 1852200, while the sum is 49.

The spelling of 256177317325 in words is "two hundred fifty-six billion, one hundred seventy-seven million, three hundred seventeen thousand, three hundred twenty-five".