18175868138 has 16 divisors (see below), whose sum is σ = 29298417984. Its totient is φ = 8425686720.

The previous prime is 18175868077. The next prime is 18175868143. The reversal of 18175868138 is 83186857181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3987158 + ... + 3991713.

It is an arithmetic number, because the mean of its divisors is an integer number (1831151124).

Almost surely, 2^18175868138 is an apocalyptic number.

18175868138 is a deficient number, since it is larger than the sum of its proper divisors (11122549846).

18175868138 is a wasteful number, since it uses less digits than its factorization.

18175868138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7978957.

The product of its digits is 2580480, while the sum is 56.

The spelling of 18175868138 in words is "eighteen billion, one hundred seventy-five million, eight hundred sixty-eight thousand, one hundred thirty-eight".