256640447751374 has 16 divisors (see below), whose sum is σ = 387008137232640. Its totient is φ = 127637846329440.

The previous prime is 256640447751371. The next prime is 256640447751377. The reversal of 256640447751374 is 473157744046652.

256640447751374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256640447751371) and next prime (256640447751377).

It is a self number, because there is not a number n which added to its sum of digits gives 256640447751374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256640447751371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23115449 + ... + 32366724.

It is an arithmetic number, because the mean of its divisors is an integer number (24188008577040).

Almost surely, 2^{256640447751374} is an apocalyptic number.

256640447751374 is a deficient number, since it is larger than the sum of its proper divisors (130367689481266).

256640447751374 is a wasteful number, since it uses less digits than its factorization.

256640447751374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55494475.

The product of its (nonzero) digits is 474163200, while the sum is 65.

The spelling of 256640447751374 in words is "two hundred fifty-six trillion, six hundred forty billion, four hundred forty-seven million, seven hundred fifty-one thousand, three hundred seventy-four".