251864055342 has 24 divisors (see below), whose sum is σ = 565916767416. Its totient is φ = 83954684952.

The previous prime is 251864055329. The next prime is 251864055349. The reversal of 251864055342 is 243550468152.

251864055342 is a `hidden beast` number, since 2 + 5 + 18 + 6 + 40 + 553 + 42 = 666.

251864055342 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251864055349) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 259118913 + ... + 259119884.

It is an arithmetic number, because the mean of its divisors is an integer number (23579865309).

Almost surely, 2^251864055342 is an apocalyptic number.

251864055342 is an abundant number, since it is smaller than the sum of its proper divisors (314052712074).

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

251864055342 is an equidigital number, since it uses as much as digits as its factorization.

251864055342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518238814 (or 518238802 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 251864055342 in words is "two hundred fifty-one billion, eight hundred sixty-four million, fifty-five thousand, three hundred forty-two".