2166899186 has 16 divisors (see below), whose sum is σ = 3514772736. Its totient is φ = 998020416.

The previous prime is 2166899167. The next prime is 2166899221. The reversal of 2166899186 is 6819986612.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676406 + ... + 679601.

It is an arithmetic number, because the mean of its divisors is an integer number (219673296).

Almost surely, 2^2166899186 is an apocalyptic number.

2166899186 is a deficient number, since it is larger than the sum of its proper divisors (1347873550).

2166899186 is a wasteful number, since it uses less digits than its factorization.

2166899186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356073.

The product of its digits is 2239488, while the sum is 56.

The square root of 2166899186 is about 46549.9644038532. The cubic root of 2166899186 is about 1294.0356333060.

The spelling of 2166899186 in words is "two billion, one hundred sixty-six million, eight hundred ninety-nine thousand, one hundred eighty-six".