251064663 has 16 divisors (see below), whose sum is σ = 339146496. Its totient is φ = 165191040.

The previous prime is 251064661. The next prime is 251064677. The reversal of 251064663 is 366460152.

It is not a de Polignac number, because 251064663 - 2¹ = 251064661 is a prime.

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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102928 + ... + 105338.

It is an arithmetic number, because the mean of its divisors is an integer number (21196656).

Almost surely, 2^251064663 is an apocalyptic number.

251064663 is a deficient number, since it is larger than the sum of its proper divisors (88081833).

251064663 is a wasteful number, since it uses less digits than its factorization.

251064663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 251064663 is about 15845.0201325211. The cubic root of 251064663 is about 630.8535193769.

The spelling of 251064663 in words is "two hundred fifty-one million, sixty-four thousand, six hundred sixty-three".