251879042168 has 16 divisors (see below), whose sum is σ = 508601912280. Its totient is φ = 116251865568.

The previous prime is 251879042147. The next prime is 251879042171. The reversal of 251879042168 is 861240978152.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210956830 + ... + 1210957037.

Almost surely, 2^251879042168 is an apocalyptic number.

It is an amenable number.

251879042168 is an abundant number, since it is smaller than the sum of its proper divisors (256722870112).

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

251879042168 is a wasteful number, since it uses less digits than its factorization.

251879042168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421913886 (or 2421913882 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 251879042168 in words is "two hundred fifty-one billion, eight hundred seventy-nine million, forty-two thousand, one hundred sixty-eight".