256642066044 has 144 divisors (see below), whose sum is σ = 824198502400. Its totient is φ = 65502380160.

The previous prime is 256642066019. The next prime is 256642066081. The reversal of 256642066044 is 440660246652.

256642066044 is a `hidden beast` number, since 2 + 566 + 4 + 20 + 6 + 60 + 4 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1161994 + ... + 1365105.

Almost surely, 2^256642066044 is an apocalyptic number.

It is an amenable number.

256642066044 is an abundant number, since it is smaller than the sum of its proper divisors (567556436356).

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

256642066044 is a wasteful number, since it uses less digits than its factorization.

256642066044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527160 (or 2527155 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 256642066044 in words is "two hundred fifty-six billion, six hundred forty-two million, sixty-six thousand, forty-four".