256516020736057 has 8 divisors (see below), whose sum is σ = 256840446953376. Its totient is φ = 256191789667392.

The previous prime is 256516020736021. The next prime is 256516020736081. The reversal of 256516020736057 is 750637020615652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256516020736057 - 2¹⁵ = 256516020703289 is a prime.

It is a super-2 number, since 2×256516020736057² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256516020735989 and 256516020736007.

It is not an unprimeable number, because it can be changed into a prime (256516020731057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46156483 + ... + 51414520.

It is an arithmetic number, because the mean of its divisors is an integer number (32105055869172).

Almost surely, 2^{256516020736057} is an apocalyptic number.

It is an amenable number.

256516020736057 is a deficient number, since it is larger than the sum of its proper divisors (324426217319).

256516020736057 is a wasteful number, since it uses less digits than its factorization.

256516020736057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97574327.

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 256516020736057 in words is "two hundred fifty-six trillion, five hundred sixteen billion, twenty million, seven hundred thirty-six thousand, fifty-seven".