256513975747788 has 24 divisors (see below), whose sum is σ = 652944665540160. Its totient is φ = 77731507802320.

The previous prime is 256513975747753. The next prime is 256513975747807. The reversal of 256513975747788 is 887747579315652.

It is a self number, because there is not a number n which added to its sum of digits gives 256513975747788.

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, 971643847398 + ... + 971643847661.

It is an arithmetic number, because the mean of its divisors is an integer number (27206027730840).

Almost surely, 2^{256513975747788} is an apocalyptic number.

It is an amenable number.

256513975747788 is an abundant number, since it is smaller than the sum of its proper divisors (396430689792372).

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

256513975747788 is a wasteful number, since it uses less digits than its factorization.

256513975747788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943287695077 (or 1943287695075 counting only the distinct ones).

The product of its digits is 24893568000, while the sum is 84.

The spelling of 256513975747788 in words is "two hundred fifty-six trillion, five hundred thirteen billion, nine hundred seventy-five million, seven hundred forty-seven thousand, seven hundred eighty-eight".