256631147302215 has 64 divisors (see below), whose sum is σ = 471352838086656. Its totient is φ = 116796483305472.

The previous prime is 256631147302141. The next prime is 256631147302223. The reversal of 256631147302215 is 512203741136652.

It is not a de Polignac number, because 256631147302215 - 2⁷ = 256631147302087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46585279 + ... + 51802031.

It is an arithmetic number, because the mean of its divisors is an integer number (7364888095104).

Almost surely, 2^{256631147302215} is an apocalyptic number.

256631147302215 is a deficient number, since it is larger than the sum of its proper divisors (214721690784441).

256631147302215 is a wasteful number, since it uses less digits than its factorization.

256631147302215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218848.

The product of its (nonzero) digits is 1814400, while the sum is 48.

Adding to 256631147302215 its reverse (512203741136652), we get a palindrome (768834888438867).

The spelling of 256631147302215 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, one hundred forty-seven million, three hundred two thousand, two hundred fifteen".