256402502406 has 32 divisors (see below), whose sum is σ = 573412550880. Its totient is φ = 84923119008.

The previous prime is 256402502359. The next prime is 256402502417. The reversal of 256402502406 is 604205204652.

256402502406 is a `hidden beast` number, since 2 + 5 + 6 + 402 + 5 + 0 + 240 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15113161 + ... + 15130116.

It is an arithmetic number, because the mean of its divisors is an integer number (17919142215).

Almost surely, 2^256402502406 is an apocalyptic number.

256402502406 is an abundant number, since it is smaller than the sum of its proper divisors (317010048474).

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

256402502406 is a wasteful number, since it uses less digits than its factorization.

256402502406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30243445 (or 30243439 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 256402502406 in words is "two hundred fifty-six billion, four hundred two million, five hundred two thousand, four hundred six".