256515747237245 has 16 divisors (see below), whose sum is σ = 311721408495360. Its totient is φ = 202611024417984.

The previous prime is 256515747237209. The next prime is 256515747237251. The reversal of 256515747237245 is 542732747515652.

It is a cyclic number.

It is not a de Polignac number, because 256515747237245 - 2²⁸ = 256515478801789 is a prime.

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, 14070167 + ... + 26664603.

It is an arithmetic number, because the mean of its divisors is an integer number (19482588030960).

Almost surely, 2^{256515747237245} is an apocalyptic number.

It is an amenable number.

256515747237245 is a deficient number, since it is larger than the sum of its proper divisors (55205661258115).

256515747237245 is a wasteful number, since it uses less digits than its factorization.

256515747237245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12646084.

The product of its digits is 493920000, while the sum is 65.

The spelling of 256515747237245 in words is "two hundred fifty-six trillion, five hundred fifteen billion, seven hundred forty-seven million, two hundred thirty-seven thousand, two hundred forty-five".