251264332655 has 16 divisors (see below), whose sum is σ = 344667087360. Its totient is φ = 172257541152.

The previous prime is 251264332651. The next prime is 251264332663. The reversal of 251264332655 is 556233462152.

251264332655 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 251264332655 - 2² = 251264332651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251264332651) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 630275 + ... + 948564.

It is an arithmetic number, because the mean of its divisors is an integer number (21541692960).

Almost surely, 2^251264332655 is an apocalyptic number.

251264332655 is a deficient number, since it is larger than the sum of its proper divisors (93402754705).

251264332655 is a wasteful number, since it uses less digits than its factorization.

251264332655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583398.

The product of its digits is 1296000, while the sum is 44.

The spelling of 251264332655 in words is "two hundred fifty-one billion, two hundred sixty-four million, three hundred thirty-two thousand, six hundred fifty-five".