256734131257134 has 20 divisors (see below), whose sum is σ = 575274627446904. Its totient is φ = 85578043752324.

The previous prime is 256734131257129. The next prime is 256734131257159. The reversal of 256734131257134 is 431752131437652.

256734131257134 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 3 + 4 + 1 + 31 + 2 + 571 + 34 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 792389293842 + ... + 792389294165.

Almost surely, 2^{256734131257134} is an apocalyptic number.

256734131257134 is an abundant number, since it is smaller than the sum of its proper divisors (318540496189770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256734131257134 is a wasteful number, since it uses less digits than its factorization.

256734131257134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584778588021 (or 1584778588012 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The spelling of 256734131257134 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred thirty-one million, two hundred fifty-seven thousand, one hundred thirty-four".