256715311401 has 48 divisors (see below), whose sum is σ = 392481369280. Its totient is φ = 161243136000.

The previous prime is 256715311361. The next prime is 256715311421. The reversal of 256715311401 is 104113517652.

256715311401 is a `hidden beast` number, since 2 + 56 + 71 + 531 + 1 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 256715311401 - 2¹³ = 256715303209 is a prime.

It is a super-2 number, since 2×256715311401² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256715311421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33418281 + ... + 33425961.

Almost surely, 2^256715311401 is an apocalyptic number.

It is an amenable number.

256715311401 is a deficient number, since it is larger than the sum of its proper divisors (135766057879).

256715311401 is a wasteful number, since it uses less digits than its factorization.

256715311401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8758 (or 8755 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 256715311401 in words is "two hundred fifty-six billion, seven hundred fifteen million, three hundred eleven thousand, four hundred one".