2166261113 has 2 divisors, whose sum is σ = 2166261114. Its totient is φ = 2166261112.

The previous prime is 2166261077. The next prime is 2166261127. The reversal of 2166261113 is 3111626612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1934856169 + 231404944 = 43987^2 + 15212^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166261113 - 2²⁰ = 2165212537 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166261613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083130556 + 1083130557.

It is an arithmetic number, because the mean of its divisors is an integer number (1083130557).

Almost surely, 2^2166261113 is an apocalyptic number.

It is an amenable number.

2166261113 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166261113 is an equidigital number, since it uses as much as digits as its factorization.

2166261113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 2166261113 is about 46543.1102634966. The cubic root of 2166261113 is about 1293.9086053602.

Adding to 2166261113 its reverse (3111626612), we get a palindrome (5277887725).

The spelling of 2166261113 in words is "two billion, one hundred sixty-six million, two hundred sixty-one thousand, one hundred thirteen".