2166404101 has 2 divisors, whose sum is σ = 2166404102. Its totient is φ = 2166404100.

The previous prime is 2166404087. The next prime is 2166404159. The reversal of 2166404101 is 1014046612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1326853476 + 839550625 = 36426^2 + 28975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166404101 - 2²⁵ = 2132849669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166404161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083202050 + 1083202051.

It is an arithmetic number, because the mean of its divisors is an integer number (1083202051).

Almost surely, 2^2166404101 is an apocalyptic number.

It is an amenable number.

2166404101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166404101 is an equidigital number, since it uses as much as digits as its factorization.

2166404101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2166404101 is about 46544.6463194211. The cubic root of 2166404101 is about 1293.9370736631.

The spelling of 2166404101 in words is "two billion, one hundred sixty-six million, four hundred four thousand, one hundred one".