256461621630 has 32 divisors (see below), whose sum is σ = 615973927968. Its totient is φ = 68337984000.

The previous prime is 256461621629. The next prime is 256461621667. The reversal of 256461621630 is 36126164652.

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, 3196071 + ... + 3275330.

It is an arithmetic number, because the mean of its divisors is an integer number (19249185249).

Almost surely, 2^256461621630 is an apocalyptic number.

256461621630 is an abundant number, since it is smaller than the sum of its proper divisors (359512306338).

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

256461621630 is a wasteful number, since it uses less digits than its factorization.

256461621630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472732.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 256461621630 in words is "two hundred fifty-six billion, four hundred sixty-one million, six hundred twenty-one thousand, six hundred thirty".