256640274014020 has 96 divisors (see below), whose sum is σ = 596083125738240. Its totient is φ = 92231081433600.

The previous prime is 256640274013957. The next prime is 256640274014027. The reversal of 256640274014020 is 20410472046652.

It is not an unprimeable number, because it can be changed into a prime (256640274014027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81273112 + ... + 84371791.

It is an arithmetic number, because the mean of its divisors is an integer number (6209199226440).

Almost surely, 2^{256640274014020} is an apocalyptic number.

256640274014020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256640274014020 is an abundant number, since it is smaller than the sum of its proper divisors (339442851724220).

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

256640274014020 is a wasteful number, since it uses less digits than its factorization.

256640274014020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165645085 (or 165645083 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 43.

The spelling of 256640274014020 in words is "two hundred fifty-six trillion, six hundred forty billion, two hundred seventy-four million, fourteen thousand, twenty".