256743503712772 has 24 divisors (see below), whose sum is σ = 449490795969600. Its totient is φ = 128317563630816.

The previous prime is 256743503712767. The next prime is 256743503712799. The reversal of 256743503712772 is 277217305347652.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 256743503712772.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795895729 + ... + 796218247.

It is an arithmetic number, because the mean of its divisors is an integer number (18728783165400).

Almost surely, 2^{256743503712772} is an apocalyptic number.

It is an amenable number.

256743503712772 is a deficient number, since it is larger than the sum of its proper divisors (192747292256828).

256743503712772 is a wasteful number, since it uses less digits than its factorization.

256743503712772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405915 (or 405913 counting only the distinct ones).

The product of its (nonzero) digits is 103723200, while the sum is 61.

The spelling of 256743503712772 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred three million, seven hundred twelve thousand, seven hundred seventy-two".