18199588868 has 6 divisors (see below), whose sum is σ = 31849280526. Its totient is φ = 9099794432.

The previous prime is 18199588859. The next prime is 18199588873. The reversal of 18199588868 is 86888599181.

It can be written as a sum of positive squares in only one way, i.e., 18190456384 + 9132484 = 134872^2 + 3022^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2274948605 + ... + 2274948612.

It is an arithmetic number, because the mean of its divisors is an integer number (5308213421).

Almost surely, 2^18199588868 is an apocalyptic number.

It is an amenable number.

18199588868 is a deficient number, since it is larger than the sum of its proper divisors (13649691658).

18199588868 is a wasteful number, since it uses less digits than its factorization.

18199588868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549897221 (or 4549897219 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 71.

The spelling of 18199588868 in words is "eighteen billion, one hundred ninety-nine million, five hundred eighty-eight thousand, eight hundred sixty-eight".