81199342186 has 16 divisors (see below), whose sum is σ = 127760053248. Its totient is φ = 38631142000.

The previous prime is 81199342157. The next prime is 81199342207. The reversal of 81199342186 is 68124399118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4612165 + ... + 4629736.

It is an arithmetic number, because the mean of its divisors is an integer number (7985003328).

Almost surely, 2^81199342186 is an apocalyptic number.

81199342186 is a deficient number, since it is larger than the sum of its proper divisors (46560711062).

81199342186 is a wasteful number, since it uses less digits than its factorization.

81199342186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9242117.

The product of its digits is 746496, while the sum is 52.

The spelling of 81199342186 in words is "eighty-one billion, one hundred ninety-nine million, three hundred forty-two thousand, one hundred eighty-six".