256626648971 has 16 divisors (see below), whose sum is σ = 323804936448. Its totient is φ = 197559549600.

The previous prime is 256626648937. The next prime is 256626648973. The reversal of 256626648971 is 179846626652.

It is not a de Polignac number, because 256626648971 - 2¹⁰ = 256626647947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256626648973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20070800 + ... + 20083581.

It is an arithmetic number, because the mean of its divisors is an integer number (20237808528).

Almost surely, 2^256626648971 is an apocalyptic number.

256626648971 is a deficient number, since it is larger than the sum of its proper divisors (67178287477).

256626648971 is a wasteful number, since it uses less digits than its factorization.

256626648971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40154482.

The product of its digits is 52254720, while the sum is 62.

The spelling of 256626648971 in words is "two hundred fifty-six billion, six hundred twenty-six million, six hundred forty-eight thousand, nine hundred seventy-one".