256640447751373 has 16 divisors (see below), whose sum is σ = 294431367960576. Its totient is φ = 219131599918320.

The previous prime is 256640447751371. The next prime is 256640447751377. The reversal of 256640447751373 is 373157744046652.

256640447751373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256640447751373 - 2¹ = 256640447751371 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 39570840 + ... + 45597502.

It is an arithmetic number, because the mean of its divisors is an integer number (18401960497536).

Almost surely, 2^{256640447751373} is an apocalyptic number.

It is an amenable number.

256640447751373 is a deficient number, since it is larger than the sum of its proper divisors (37790920209203).

256640447751373 is a wasteful number, since it uses less digits than its factorization.

256640447751373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6050064.

The product of its (nonzero) digits is 355622400, while the sum is 64.

The spelling of 256640447751373 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-three".