2166803986 has 32 divisors (see below), whose sum is σ = 3542216832. Its totient is φ = 990232320.

The previous prime is 2166803939. The next prime is 2166804007. The reversal of 2166803986 is 6893086612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155040 + ... + 168436.

It is an arithmetic number, because the mean of its divisors is an integer number (110694276).

Almost surely, 2^2166803986 is an apocalyptic number.

2166803986 is a deficient number, since it is larger than the sum of its proper divisors (1375412846).

2166803986 is a wasteful number, since it uses less digits than its factorization.

2166803986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13554.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 2166803986 is about 46548.9418354488. The cubic root of 2166803986 is about 1294.0166824172.

The spelling of 2166803986 in words is "two billion, one hundred sixty-six million, eight hundred three thousand, nine hundred eighty-six".