256515752645765 has 16 divisors (see below), whose sum is σ = 312036355040256. Its totient is φ = 202400981136000.

The previous prime is 256515752645759. The next prime is 256515752645909. The reversal of 256515752645765 is 567546257515652.

It is not a de Polignac number, because 256515752645765 - 2¹⁶ = 256515752580229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259002860 + ... + 259991370.

It is an arithmetic number, because the mean of its divisors is an integer number (19502272190016).

Almost surely, 2^{256515752645765} is an apocalyptic number.

It is an amenable number.

256515752645765 is a deficient number, since it is larger than the sum of its proper divisors (55520602394491).

256515752645765 is an equidigital number, since it uses as much as digits as its factorization.

256515752645765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699540.

The product of its digits is 2646000000, while the sum is 71.

The spelling of 256515752645765 in words is "two hundred fifty-six trillion, five hundred fifteen billion, seven hundred fifty-two million, six hundred forty-five thousand, seven hundred sixty-five".