251320664 has 16 divisors (see below), whose sum is σ = 538544400. Its totient is φ = 107708832.

The previous prime is 251320607. The next prime is 251320669. The reversal of 251320664 is 466023152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251320669) by changing a digit.

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, 2243879 + ... + 2243990.

It is an arithmetic number, because the mean of its divisors is an integer number (33659025).

Almost surely, 2^251320664 is an apocalyptic number.

It is an amenable number.

251320664 is an abundant number, since it is smaller than the sum of its proper divisors (287223736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251320664 is a wasteful number, since it uses less digits than its factorization.

251320664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487882 (or 4487878 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 251320664 is about 15853.0963537096. The cubic root of 251320664 is about 631.0678655795.

The spelling of 251320664 in words is "two hundred fifty-one million, three hundred twenty thousand, six hundred sixty-four".