256640031751350 has 48 divisors (see below), whose sum is σ = 685426300190352. Its totient is φ = 63172930892160.

The previous prime is 256640031751339. The next prime is 256640031751351. The reversal of 256640031751350 is 53157130046652.

It is a happy number.

It is a super-2 number, since 2×256640031751350² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256640031751350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256640031751351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65805134397 + ... + 65805138296.

It is an arithmetic number, because the mean of its divisors is an integer number (14279714587299).

Almost surely, 2^{256640031751350} is an apocalyptic number.

256640031751350 is an abundant number, since it is smaller than the sum of its proper divisors (428786268439002).

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

256640031751350 is a wasteful number, since it uses less digits than its factorization.

256640031751350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131610272721 (or 131610272716 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 256640031751350 in words is "two hundred fifty-six trillion, six hundred forty billion, thirty-one million, seven hundred fifty-one thousand, three hundred fifty".