256603400604 has 24 divisors (see below), whose sum is σ = 665268075920. Its totient is φ = 85534466832.

The previous prime is 256603400531. The next prime is 256603400609. The reversal of 256603400604 is 406004306652.

256603400604 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 0 + 3 + 40 + 0 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603400609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187978599 + ... + 1187978814.

Almost surely, 2^256603400604 is an apocalyptic number.

It is an amenable number.

256603400604 is an abundant number, since it is smaller than the sum of its proper divisors (408664675316).

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

256603400604 is a wasteful number, since it uses less digits than its factorization.

256603400604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375957426 (or 2375957418 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 256603400604 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, six hundred four".