256878374535 has 24 divisors (see below), whose sum is σ = 445274746800. Its totient is φ = 136995985152.

The previous prime is 256878374513. The next prime is 256878374567. The reversal of 256878374535 is 535473878652.

256878374535 is a `hidden beast` number, since 2 + 5 + 68 + 7 + 8 + 37 + 4 + 535 = 666.

It is not a de Polignac number, because 256878374535 - 2¹² = 256878370439 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1082292 + ... + 1298118.

It is an arithmetic number, because the mean of its divisors is an integer number (18553114450).

Almost surely, 2^256878374535 is an apocalyptic number.

256878374535 is a deficient number, since it is larger than the sum of its proper divisors (188396372265).

256878374535 is a wasteful number, since it uses less digits than its factorization.

256878374535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242287 (or 242284 counting only the distinct ones).

The product of its digits is 169344000, while the sum is 63.

The spelling of 256878374535 in words is "two hundred fifty-six billion, eight hundred seventy-eight million, three hundred seventy-four thousand, five hundred thirty-five".