251655164 has 6 divisors (see below), whose sum is σ = 440396544. Its totient is φ = 125827580.

The previous prime is 251655161. The next prime is 251655193. The reversal of 251655164 is 461556152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251655161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31456892 + ... + 31456899.

It is an arithmetic number, because the mean of its divisors is an integer number (73399424).

Almost surely, 2^251655164 is an apocalyptic number.

It is an amenable number.

251655164 is a deficient number, since it is larger than the sum of its proper divisors (188741380).

251655164 is a wasteful number, since it uses less digits than its factorization.

251655164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62913795 (or 62913793 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 251655164 is about 15863.6428351120. The cubic root of 251655164 is about 631.3477187022.

The spelling of 251655164 in words is "two hundred fifty-one million, six hundred fifty-five thousand, one hundred sixty-four".