256759639320 has 64 divisors (see below), whose sum is σ = 771062872320. Its totient is φ = 68399552384.

The previous prime is 256759639319. The next prime is 256759639321. The reversal of 256759639320 is 23936957652.

It is an interprime number because it is at equal distance from previous prime (256759639319) and next prime (256759639321).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256759639321) 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, 970374 + ... + 1206293.

It is an arithmetic number, because the mean of its divisors is an integer number (12047857380).

Almost surely, 2^256759639320 is an apocalyptic number.

256759639320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256759639320 is an abundant number, since it is smaller than the sum of its proper divisors (514303233000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256759639320 is a wasteful number, since it uses less digits than its factorization.

256759639320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177664 (or 2177660 counting only the distinct ones).

The product of its (nonzero) digits is 18370800, while the sum is 57.

The spelling of 256759639320 in words is "two hundred fifty-six billion, seven hundred fifty-nine million, six hundred thirty-nine thousand, three hundred twenty".