2161662689 has 2 divisors, whose sum is σ = 2161662690. Its totient is φ = 2161662688.

The previous prime is 2161662683. The next prime is 2161662703. The reversal of 2161662689 is 9862661612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2023200400 + 138462289 = 44980^2 + 11767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161662689 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161662683) 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, 1080831344 + 1080831345.

It is an arithmetic number, because the mean of its divisors is an integer number (1080831345).

Almost surely, 2^2161662689 is an apocalyptic number.

It is an amenable number.

2161662689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161662689 is an equidigital number, since it uses as much as digits as its factorization.

2161662689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 2161662689 is about 46493.6843990665. The cubic root of 2161662689 is about 1292.9924099558.

The spelling of 2161662689 in words is "two billion, one hundred sixty-one million, six hundred sixty-two thousand, six hundred eighty-nine".