256671571530 has 64 divisors (see below), whose sum is σ = 672642403200. Its totient is φ = 62165118720.

The previous prime is 256671571523. The next prime is 256671571657. The reversal of 256671571530 is 35175176652.

It is a self number, because there is not a number n which added to its sum of digits gives 256671571530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11025 + ... + 716564.

It is an arithmetic number, because the mean of its divisors is an integer number (10510037550).

Almost surely, 2^256671571530 is an apocalyptic number.

256671571530 is an abundant number, since it is smaller than the sum of its proper divisors (415970831670).

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

256671571530 is a wasteful number, since it uses less digits than its factorization.

256671571530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728679.

The product of its (nonzero) digits is 1323000, while the sum is 48.

The spelling of 256671571530 in words is "two hundred fifty-six billion, six hundred seventy-one million, five hundred seventy-one thousand, five hundred thirty".