251064664 has 8 divisors (see below), whose sum is σ = 470746260. Its totient is φ = 125532328.

The previous prime is 251064661. The next prime is 251064677. The reversal of 251064664 is 466460152.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251064661) 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 as a sum of consecutive naturals, namely, 15691534 + ... + 15691549.

Almost surely, 2^251064664 is an apocalyptic number.

It is an amenable number.

251064664 is a deficient number, since it is larger than the sum of its proper divisors (219681596).

251064664 is a wasteful number, since it uses less digits than its factorization.

251064664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31383089 (or 31383085 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 251064664 is about 15845.0201640768. The cubic root of 251064664 is about 630.8535202144.

The spelling of 251064664 in words is "two hundred fifty-one million, sixty-four thousand, six hundred sixty-four".