18216219819996 has 72 divisors (see below), whose sum is σ = 52093073096064. Its totient is φ = 5520066608880.

The previous prime is 18216219819971. The next prime is 18216219820013. The reversal of 18216219819996 is 69991891261281.

It is a happy number.

18216219819996 is a `hidden beast` number, since 1 + 8 + 2 + 162 + 198 + 199 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 851851440 + ... + 851872823.

It is an arithmetic number, because the mean of its divisors is an integer number (723514904112).

Almost surely, 2^{18216219819996} is an apocalyptic number.

It is an amenable number.

18216219819996 is an abundant number, since it is smaller than the sum of its proper divisors (33876853276068).

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

18216219819996 is a wasteful number, since it uses less digits than its factorization.

18216219819996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703724293 (or 1703724279 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 72.

The spelling of 18216219819996 in words is "eighteen trillion, two hundred sixteen billion, two hundred nineteen million, eight hundred nineteen thousand, nine hundred ninety-six".