199819818186 has 32 divisors (see below), whose sum is σ = 418055326848. Its totient is φ = 63551769600.

The previous prime is 199819818139. The next prime is 199819818217. The reversal of 199819818186 is 681818918991.

199819818186 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199819818186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750111 + ... + 1860786.

It is an arithmetic number, because the mean of its divisors is an integer number (13064228964).

Almost surely, 2^199819818186 is an apocalyptic number.

199819818186 is an abundant number, since it is smaller than the sum of its proper divisors (218235508662).

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

199819818186 is a wasteful number, since it uses less digits than its factorization.

199819818186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611326.

The product of its digits is 17915904, while the sum is 69.

The spelling of 199819818186 in words is "one hundred ninety-nine billion, eight hundred nineteen million, eight hundred eighteen thousand, one hundred eighty-six".