256412512566 has 48 divisors (see below), whose sum is σ = 634959746304. Its totient is φ = 73256849712.

The previous prime is 256412512549. The next prime is 256412512673. The reversal of 256412512566 is 665215214652.

256412512566 is a `hidden beast` number, since 2 + 5 + 64 + 1 + 25 + 1 + 2 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3051471 + ... + 3134373.

It is an arithmetic number, because the mean of its divisors is an integer number (13228328048).

Almost surely, 2^256412512566 is an apocalyptic number.

256412512566 is an abundant number, since it is smaller than the sum of its proper divisors (378547233738).

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

256412512566 is a wasteful number, since it uses less digits than its factorization.

256412512566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107465 (or 107462 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 256412512566 in words is "two hundred fifty-six billion, four hundred twelve million, five hundred twelve thousand, five hundred sixty-six".