2166208873 has 2 divisors, whose sum is σ = 2166208874. Its totient is φ = 2166208872.

The previous prime is 2166208859. The next prime is 2166208907. The reversal of 2166208873 is 3788026612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1865116969 + 301091904 = 43187^2 + 17352^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166208873 - 2⁵ = 2166208841 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166208813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083104436 + 1083104437.

It is an arithmetic number, because the mean of its divisors is an integer number (1083104437).

Almost surely, 2^2166208873 is an apocalyptic number.

It is an amenable number.

2166208873 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166208873 is an equidigital number, since it uses as much as digits as its factorization.

2166208873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 2166208873 is about 46542.5490599731. The cubic root of 2166208873 is about 1293.8982042858.

The spelling of 2166208873 in words is "two billion, one hundred sixty-six million, two hundred eight thousand, eight hundred seventy-three".