18216786166 has 16 divisors (see below), whose sum is σ = 27740036304. Its totient is φ = 8971092064.

The previous prime is 18216786157. The next prime is 18216786173. The reversal of 18216786166 is 66168761281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209005 + ... + 283048.

It is an arithmetic number, because the mean of its divisors is an integer number (1733752269).

Almost surely, 2^18216786166 is an apocalyptic number.

18216786166 is a deficient number, since it is larger than the sum of its proper divisors (9523250138).

18216786166 is a wasteful number, since it uses less digits than its factorization.

18216786166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492335.

The product of its digits is 1161216, while the sum is 52.

The spelling of 18216786166 in words is "eighteen billion, two hundred sixteen million, seven hundred eighty-six thousand, one hundred sixty-six".