251045504500 has 96 divisors (see below), whose sum is σ = 626761175040. Its totient is φ = 86051923200.

The previous prime is 251045504467. The next prime is 251045504503. The reversal of 251045504500 is 5405540152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251045504503) 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 31 ways as a sum of consecutive naturals, for example, 23770221 + ... + 23780779.

It is an arithmetic number, because the mean of its divisors is an integer number (6528762240).

Almost surely, 2^251045504500 is an apocalyptic number.

251045504500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251045504500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313380587520).

251045504500 is an abundant number, since it is smaller than the sum of its proper divisors (375715670540).

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

251045504500 is a wasteful number, since it uses less digits than its factorization.

251045504500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17378 (or 17366 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 251045504500 in words is "two hundred fifty-one billion, forty-five million, five hundred four thousand, five hundred".