256971577280 has 56 divisors (see below), whose sum is σ = 667542083760. Its totient is φ = 93444208640.

The previous prime is 256971577253. The next prime is 256971577297. The reversal of 256971577280 is 82775179652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36498125 + ... + 36505164.

Almost surely, 2^256971577280 is an apocalyptic number.

256971577280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256971577280 is an abundant number, since it is smaller than the sum of its proper divisors (410570506480).

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

256971577280 is a wasteful number, since it uses less digits than its factorization.

256971577280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73003317 (or 73003307 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 59.

The spelling of 256971577280 in words is "two hundred fifty-six billion, nine hundred seventy-one million, five hundred seventy-seven thousand, two hundred eighty".