256878374534 has 8 divisors (see below), whose sum is σ = 391634243328. Its totient is φ = 126333626760.

The previous prime is 256878374513. The next prime is 256878374567. The reversal of 256878374534 is 435473878652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052780102 + ... + 1052780345.

It is an arithmetic number, because the mean of its divisors is an integer number (48954280416).

Almost surely, 2^256878374534 is an apocalyptic number.

256878374534 is a deficient number, since it is larger than the sum of its proper divisors (134755868794).

256878374534 is a wasteful number, since it uses less digits than its factorization.

256878374534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105560510.

The product of its digits is 135475200, while the sum is 62.

The spelling of 256878374534 in words is "two hundred fifty-six billion, eight hundred seventy-eight million, three hundred seventy-four thousand, five hundred thirty-four".