18249994388 has 12 divisors (see below), whose sum is σ = 31938616500. Its totient is φ = 9124675392.

The previous prime is 18249994337. The next prime is 18249994397. The reversal of 18249994388 is 88349994281.

It can be written as a sum of positive squares in 2 ways, for example, as 2095075984 + 16154918404 = 45772^2 + 127102^2 .

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, 84920 + ... + 209072.

It is an arithmetic number, because the mean of its divisors is an integer number (2661551375).

Almost surely, 2^18249994388 is an apocalyptic number.

It is an amenable number.

18249994388 is a deficient number, since it is larger than the sum of its proper divisors (13688622112).

18249994388 is a wasteful number, since it uses less digits than its factorization.

18249994388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160906 (or 160904 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 65.

The spelling of 18249994388 in words is "eighteen billion, two hundred forty-nine million, nine hundred ninety-four thousand, three hundred eighty-eight".