256506400515402 has 64 divisors (see below), whose sum is σ = 575093926350720. Its totient is φ = 84740271033600.

The previous prime is 256506400515377. The next prime is 256506400515433. The reversal of 256506400515402 is 204515004605652.

256506400515402 is a `hidden beast` number, since 2 + 5 + 6 + 50 + 6 + 4 + 0 + 0 + 51 + 540 + 2 = 666.

It is a super-2 number, since 2×256506400515402² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98673777 + ... + 101239947.

It is an arithmetic number, because the mean of its divisors is an integer number (8985842599230).

Almost surely, 2^{256506400515402} is an apocalyptic number.

256506400515402 is an abundant number, since it is smaller than the sum of its proper divisors (318587525835318).

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

256506400515402 is a wasteful number, since it uses less digits than its factorization.

256506400515402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582676 (or 2582670 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 256506400515402 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred million, five hundred fifteen thousand, four hundred two".