256742751042520 has 32 divisors (see below), whose sum is σ = 578114529325920. Its totient is φ = 102618284509440.

The previous prime is 256742751042431. The next prime is 256742751042529. The reversal of 256742751042520 is 25240157247652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256742751042529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462944341 + ... + 2463048580.

It is an arithmetic number, because the mean of its divisors is an integer number (18066079041435).

Almost surely, 2^{256742751042520} is an apocalyptic number.

256742751042520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256742751042520 is an abundant number, since it is smaller than the sum of its proper divisors (321371778283400).

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

256742751042520 is a wasteful number, since it uses less digits than its factorization.

256742751042520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4925994235 (or 4925994231 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 52.

The spelling of 256742751042520 in words is "two hundred fifty-six trillion, seven hundred forty-two billion, seven hundred fifty-one million, forty-two thousand, five hundred twenty".