256544360487634 has 16 divisors (see below), whose sum is σ = 391580726796000. Its totient is φ = 126036478802304.

The previous prime is 256544360487553. The next prime is 256544360487637. The reversal of 256544360487634 is 436784063445652.

It is a self number, because there is not a number n which added to its sum of digits gives 256544360487634.

It is not an unprimeable number, because it can be changed into a prime (256544360487637) 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, 4756784584 + ... + 4756838515.

It is an arithmetic number, because the mean of its divisors is an integer number (24473795424750).

Almost surely, 2^{256544360487634} is an apocalyptic number.

256544360487634 is a deficient number, since it is larger than the sum of its proper divisors (135036366308366).

256544360487634 is a wasteful number, since it uses less digits than its factorization.

256544360487634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9513623337.

The product of its (nonzero) digits is 1393459200, while the sum is 67.

The spelling of 256544360487634 in words is "two hundred fifty-six trillion, five hundred forty-four billion, three hundred sixty million, four hundred eighty-seven thousand, six hundred thirty-four".