251979871125 has 32 divisors (see below), whose sum is σ = 420808377600. Its totient is φ = 133904049600.

The previous prime is 251979871097. The next prime is 251979871141. The reversal of 251979871125 is 521178979152.

It is not a de Polignac number, because 251979871125 - 2⁶ = 251979871061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1109025 + ... + 1316774.

It is an arithmetic number, because the mean of its divisors is an integer number (13150261800).

Almost surely, 2^251979871125 is an apocalyptic number.

251979871125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251979871125 is a deficient number, since it is larger than the sum of its proper divisors (168828506475).

251979871125 is a wasteful number, since it uses less digits than its factorization.

251979871125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426094 (or 2426084 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 57.

The spelling of 251979871125 in words is "two hundred fifty-one billion, nine hundred seventy-nine million, eight hundred seventy-one thousand, one hundred twenty-five".