251395225824 has 48 divisors (see below), whose sum is σ = 673953170688. Its totient is φ = 82015462272.

The previous prime is 251395225771. The next prime is 251395225891. The reversal of 251395225824 is 428522593152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27854002 + ... + 27863025.

It is an arithmetic number, because the mean of its divisors is an integer number (14040691056).

Almost surely, 2^251395225824 is an apocalyptic number.

251395225824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

251395225824 is an abundant number, since it is smaller than the sum of its proper divisors (422557944864).

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

251395225824 is a wasteful number, since it uses less digits than its factorization.

251395225824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55717087 (or 55717079 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 251395225824 in words is "two hundred fifty-one billion, three hundred ninety-five million, two hundred twenty-five thousand, eight hundred twenty-four".