2166566201 has 2 divisors, whose sum is σ = 2166566202. Its totient is φ = 2166566200.

The previous prime is 2166566189. The next prime is 2166566209. The reversal of 2166566201 is 1026656612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1436485801 + 730080400 = 37901^2 + 27020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166566201 - 2¹⁴ = 2166549817 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166566209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083283100 + 1083283101.

It is an arithmetic number, because the mean of its divisors is an integer number (1083283101).

Almost surely, 2^2166566201 is an apocalyptic number.

It is an amenable number.

2166566201 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166566201 is an equidigital number, since it uses as much as digits as its factorization.

2166566201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 2166566201 is about 46546.3876256794. The cubic root of 2166566201 is about 1293.9693455691.

The spelling of 2166566201 in words is "two billion, one hundred sixty-six million, five hundred sixty-six thousand, two hundred one".