251655315872 has 12 divisors (see below), whose sum is σ = 495446403186. Its totient is φ = 125827657920.

The previous prime is 251655315869. The next prime is 251655315907. The reversal of 251655315872 is 278513556152.

251655315872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 206083313296 + 45572002576 = 453964^2 + 213476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 251655315872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932114279 + ... + 3932114342.

Almost surely, 2^251655315872 is an apocalyptic number.

It is an amenable number.

251655315872 is a deficient number, since it is larger than the sum of its proper divisors (243791087314).

251655315872 is an equidigital number, since it uses as much as digits as its factorization.

251655315872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7864228631 (or 7864228623 counting only the distinct ones).

The product of its digits is 2520000, while the sum is 50.

The spelling of 251655315872 in words is "two hundred fifty-one billion, six hundred fifty-five million, three hundred fifteen thousand, eight hundred seventy-two".