251164799988 has 24 divisors (see below), whose sum is σ = 606259862880. Its totient is φ = 80834648160.

The previous prime is 251164799987. The next prime is 251164800001. The reversal of 251164799988 is 889997461152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251164799987) 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 in 7 ways as a sum of consecutive naturals, for example, 360868618 + ... + 360869313.

It is an arithmetic number, because the mean of its divisors is an integer number (25260827620).

Almost surely, 2^251164799988 is an apocalyptic number.

It is an amenable number.

251164799988 is an abundant number, since it is smaller than the sum of its proper divisors (355095062892).

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

251164799988 is a wasteful number, since it uses less digits than its factorization.

251164799988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721737967 (or 721737965 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 69.

The spelling of 251164799988 in words is "two hundred fifty-one billion, one hundred sixty-four million, seven hundred ninety-nine thousand, nine hundred eighty-eight".