18019998181836 has 60 divisors (see below), whose sum is σ = 53837525438928. Its totient is φ = 5148570908448.

The previous prime is 18019998181813. The next prime is 18019998181853. The reversal of 18019998181836 is 63818189991081.

18019998181836 is a `hidden beast` number, since 180 + 199 + 9 + 8 + 181 + 83 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3972660471 + ... + 3972665006.

Almost surely, 2^{18019998181836} is an apocalyptic number.

It is an amenable number.

18019998181836 is an abundant number, since it is smaller than the sum of its proper divisors (35817527257092).

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

18019998181836 is a wasteful number, since it uses less digits than its factorization.

18019998181836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945325500 (or 7945325489 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 72.

The spelling of 18019998181836 in words is "eighteen trillion, nineteen billion, nine hundred ninety-eight million, one hundred eighty-one thousand, eight hundred thirty-six".