256464108257 has 12 divisors (see below), whose sum is σ = 298449774036. Its totient is φ = 219742397280.

The previous prime is 256464108227. The next prime is 256464108301. The reversal of 256464108257 is 752801464652.

It can be written as a sum of positive squares in 2 ways, for example, as 227596739041 + 28867369216 = 477071^2 + 169904^2 .

It is not a de Polignac number, because 256464108257 - 2⁸ = 256464108001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256464108217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 870038 + ... + 1126895.

It is an arithmetic number, because the mean of its divisors is an integer number (24870814503).

Almost surely, 2^256464108257 is an apocalyptic number.

It is an amenable number.

256464108257 is a deficient number, since it is larger than the sum of its proper divisors (41985665779).

256464108257 is a wasteful number, since it uses less digits than its factorization.

256464108257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999568 (or 1999561 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 50.

The spelling of 256464108257 in words is "two hundred fifty-six billion, four hundred sixty-four million, one hundred eight thousand, two hundred fifty-seven".