2165722913 has 2 divisors, whose sum is σ = 2165722914. Its totient is φ = 2165722912.

The previous prime is 2165722891. The next prime is 2165722921. The reversal of 2165722913 is 3192275612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1549839424 + 615883489 = 39368^2 + 24817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2165722913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165722943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082861456 + 1082861457.

It is an arithmetic number, because the mean of its divisors is an integer number (1082861457).

Almost surely, 2^2165722913 is an apocalyptic number.

It is an amenable number.

2165722913 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165722913 is an equidigital number, since it uses as much as digits as its factorization.

2165722913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 2165722913 is about 46537.3281678267. The cubic root of 2165722913 is about 1293.8014407950.

The spelling of 2165722913 in words is "two billion, one hundred sixty-five million, seven hundred twenty-two thousand, nine hundred thirteen".