2166874691 has 2 divisors, whose sum is σ = 2166874692. Its totient is φ = 2166874690.

The previous prime is 2166874687. The next prime is 2166874709. The reversal of 2166874691 is 1964786612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166874691 - 2² = 2166874687 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166874601) 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, 1083437345 + 1083437346.

It is an arithmetic number, because the mean of its divisors is an integer number (1083437346).

Almost surely, 2^2166874691 is an apocalyptic number.

2166874691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166874691 is an equidigital number, since it uses as much as digits as its factorization.

2166874691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 2166874691 is about 46549.7012987194. The cubic root of 2166874691 is about 1294.0307572873.

The spelling of 2166874691 in words is "two billion, one hundred sixty-six million, eight hundred seventy-four thousand, six hundred ninety-one".