251631120668 has 12 divisors (see below), whose sum is σ = 440403719952. Its totient is φ = 125801486400.

The previous prime is 251631120647. The next prime is 251631120677. The reversal of 251631120668 is 866021136152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478205 + ... + 3549812.

It is an arithmetic number, because the mean of its divisors is an integer number (36700309996).

Almost surely, 2^251631120668 is an apocalyptic number.

It is an amenable number.

251631120668 is a deficient number, since it is larger than the sum of its proper divisors (188772599284).

251631120668 is a wasteful number, since it uses less digits than its factorization.

251631120668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036972 (or 7036970 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 251631120668 in words is "two hundred fifty-one billion, six hundred thirty-one million, one hundred twenty thousand, six hundred sixty-eight".