2165722997 has 2 divisors, whose sum is σ = 2165722998. Its totient is φ = 2165722996.

The previous prime is 2165722963. The next prime is 2165723003. The reversal of 2165722997 is 7992275612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2164017361 + 1705636 = 46519^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165722997 - 2²⁴ = 2148945781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165721997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082861498 + 1082861499.

It is an arithmetic number, because the mean of its divisors is an integer number (1082861499).

Almost surely, 2^2165722997 is an apocalyptic number.

It is an amenable number.

2165722997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165722997 is an equidigital number, since it uses as much as digits as its factorization.

2165722997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 50.

The square root of 2165722997 is about 46537.3290703280. The cubic root of 2165722997 is about 1293.8014575222.

The spelling of 2165722997 in words is "two billion, one hundred sixty-five million, seven hundred twenty-two thousand, nine hundred ninety-seven".