2166216090 has 16 divisors (see below), whose sum is σ = 5198918688. Its totient is φ = 577657616.

The previous prime is 2166216083. The next prime is 2166216113. The reversal of 2166216090 is 906126612.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 36103572 + ... + 36103631.

It is an arithmetic number, because the mean of its divisors is an integer number (324932418).

Almost surely, 2^2166216090 is an apocalyptic number.

2166216090 is an abundant number, since it is smaller than the sum of its proper divisors (3032702598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166216090 is a wasteful number, since it uses less digits than its factorization.

2166216090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72207213.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 2166216090 is about 46542.6265911154. The cubic root of 2166216090 is about 1293.8996412129.

The spelling of 2166216090 in words is "two billion, one hundred sixty-six million, two hundred sixteen thousand, ninety".