2105666369 has 2 divisors, whose sum is σ = 2105666370. Its totient is φ = 2105666368.

The previous prime is 2105666363. The next prime is 2105666371. The reversal of 2105666369 is 9636665012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1937056144 + 168610225 = 44012^2 + 12985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105666369 - 2⁸ = 2105666113 is a prime.

It is a super-2 number, since 2×2105666369² = 8867661715075288322, which contains 22 as substring.

Together with 2105666371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2105666363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052833184 + 1052833185.

It is an arithmetic number, because the mean of its divisors is an integer number (1052833185).

Almost surely, 2^2105666369 is an apocalyptic number.

It is an amenable number.

2105666369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105666369 is an equidigital number, since it uses as much as digits as its factorization.

2105666369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 2105666369 is about 45887.5404548991. The cubic root of 2105666369 is about 1281.7299137843.

The spelling of 2105666369 in words is "two billion, one hundred five million, six hundred sixty-six thousand, three hundred sixty-nine".