251728388725 has 48 divisors (see below), whose sum is σ = 348706163520. Its totient is φ = 178680499200.

The previous prime is 251728388711. The next prime is 251728388749. The reversal of 251728388725 is 527883827152.

It is a happy number.

It is not a de Polignac number, because 251728388725 - 2¹¹ = 251728386677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251728388725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16890477 + ... + 16905373.

It is an arithmetic number, because the mean of its divisors is an integer number (7264711740).

Almost surely, 2^251728388725 is an apocalyptic number.

251728388725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251728388725 is a deficient number, since it is larger than the sum of its proper divisors (96977774795).

251728388725 is a wasteful number, since it uses less digits than its factorization.

251728388725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390 (or 16385 counting only the distinct ones).

The product of its digits is 15052800, while the sum is 58.

The spelling of 251728388725 in words is "two hundred fifty-one billion, seven hundred twenty-eight million, three hundred eighty-eight thousand, seven hundred twenty-five".