251055994168 has 16 divisors (see below), whose sum is σ = 537977130480. Its totient is φ = 107595426048.

The previous prime is 251055994157. The next prime is 251055994177. The reversal of 251055994168 is 861499550152.

251055994168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251055994168² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2241571321 + ... + 2241571432.

It is an arithmetic number, because the mean of its divisors is an integer number (33623570655).

Almost surely, 2^251055994168 is an apocalyptic number.

251055994168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

251055994168 is an abundant number, since it is smaller than the sum of its proper divisors (286921136312).

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

251055994168 is a wasteful number, since it uses less digits than its factorization.

251055994168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4483142766 (or 4483142762 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 251055994168 in words is "two hundred fifty-one billion, fifty-five million, nine hundred ninety-four thousand, one hundred sixty-eight".