2166811613 has 2 divisors, whose sum is σ = 2166811614. Its totient is φ = 2166811612.

The previous prime is 2166811607. The next prime is 2166811627. The reversal of 2166811613 is 3161186612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2165785444 + 1026169 = 46538^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166811613 - 2¹⁴ = 2166795229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166841613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083405806 + 1083405807.

It is an arithmetic number, because the mean of its divisors is an integer number (1083405807).

Almost surely, 2^2166811613 is an apocalyptic number.

It is an amenable number.

2166811613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166811613 is an equidigital number, since it uses as much as digits as its factorization.

2166811613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 2166811613 is about 46549.0237599028. The cubic root of 2166811613 is about 1294.0182006984.

The spelling of 2166811613 in words is "two billion, one hundred sixty-six million, eight hundred eleven thousand, six hundred thirteen".