18513994196 has 12 divisors (see below), whose sum is σ = 32404853460. Its totient is φ = 9255464640.

The previous prime is 18513994171. The next prime is 18513994201. The reversal of 18513994196 is 69149931581.

It can be written as a sum of positive squares in 2 ways, for example, as 8007744196 + 10506250000 = 89486^2 + 102500^2 .

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, 355715 + ... + 404426.

It is an arithmetic number, because the mean of its divisors is an integer number (2700404455).

Almost surely, 2^18513994196 is an apocalyptic number.

It is an amenable number.

18513994196 is a deficient number, since it is larger than the sum of its proper divisors (13890859264).

18513994196 is a wasteful number, since it uses less digits than its factorization.

18513994196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766234 (or 766232 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 56.

The spelling of 18513994196 in words is "eighteen billion, five hundred thirteen million, nine hundred ninety-four thousand, one hundred ninety-six".