256521549752 has 32 divisors (see below), whose sum is σ = 518001674400. Its totient is φ = 118388740224.

The previous prime is 256521549719. The next prime is 256521549769. The reversal of 256521549752 is 257945125652.

It is a super-2 number, since 2×256521549752² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256521549694 and 256521549703.

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, 2640374 + ... + 2735802.

It is an arithmetic number, because the mean of its divisors is an integer number (16187552325).

Almost surely, 2^256521549752 is an apocalyptic number.

It is an amenable number.

256521549752 is an abundant number, since it is smaller than the sum of its proper divisors (261480124648).

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

256521549752 is a wasteful number, since it uses less digits than its factorization.

256521549752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121295 (or 121291 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 53.

The spelling of 256521549752 in words is "two hundred fifty-six billion, five hundred twenty-one million, five hundred forty-nine thousand, seven hundred fifty-two".