256517270556740 has 96 divisors (see below), whose sum is σ = 580702239500544. Its totient is φ = 94836393881600.

The previous prime is 256517270556739. The next prime is 256517270556779. The reversal of 256517270556740 is 47655072715652.

It is a super-2 number, since 2×256517270556740² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22502561 + ... + 31928040.

It is an arithmetic number, because the mean of its divisors is an integer number (6048981661464).

Almost surely, 2^{256517270556740} is an apocalyptic number.

256517270556740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256517270556740 is an abundant number, since it is smaller than the sum of its proper divisors (324184968943804).

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

256517270556740 is a wasteful number, since it uses less digits than its factorization.

256517270556740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54430877 (or 54430875 counting only the distinct ones).

The product of its (nonzero) digits is 123480000, while the sum is 62.

The spelling of 256517270556740 in words is "two hundred fifty-six trillion, five hundred seventeen billion, two hundred seventy million, five hundred fifty-six thousand, seven hundred forty".