2166803985 has 32 divisors (see below), whose sum is σ = 3667973760. Its totient is φ = 1089220608.

The previous prime is 2166803939. The next prime is 2166804007. The reversal of 2166803985 is 5893086612.

It is a happy number.

It is not a de Polignac number, because 2166803985 - 2⁷ = 2166803857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36849 + ... + 75441.

It is an arithmetic number, because the mean of its divisors is an integer number (114624180).

Almost surely, 2^2166803985 is an apocalyptic number.

It is an amenable number.

2166803985 is a deficient number, since it is larger than the sum of its proper divisors (1501169775).

2166803985 is a wasteful number, since it uses less digits than its factorization.

2166803985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38817.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 2166803985 is about 46548.9418247075. The cubic root of 2166803985 is about 1294.0166822181.

The spelling of 2166803985 in words is "two billion, one hundred sixty-six million, eight hundred three thousand, nine hundred eighty-five".