256744422171135 has 80 divisors (see below), whose sum is σ = 461202058386432. Its totient is φ = 136643607979200.

The previous prime is 256744422171089. The next prime is 256744422171157. The reversal of 256744422171135 is 531171224447652.

256744422171135 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 44 + 422 + 171 + 1 + 3 + 5 = 666.

It is not a de Polignac number, because 256744422171135 - 2⁷ = 256744422171007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5494539142 + ... + 5494585868.

Almost surely, 2^{256744422171135} is an apocalyptic number.

256744422171135 is a deficient number, since it is larger than the sum of its proper divisors (204457636215297).

256744422171135 is a wasteful number, since it uses less digits than its factorization.

256744422171135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74866 (or 74857 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 256744422171135 in words is "two hundred fifty-six trillion, seven hundred forty-four billion, four hundred twenty-two million, one hundred seventy-one thousand, one hundred thirty-five".