2165816717 has 2 divisors, whose sum is σ = 2165816718. Its totient is φ = 2165816716.

The previous prime is 2165816713. The next prime is 2165816753. The reversal of 2165816717 is 7176185612.

2165816717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1277419081 + 888397636 = 35741^2 + 29806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165816717 - 2² = 2165816713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165816713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082908358 + 1082908359.

It is an arithmetic number, because the mean of its divisors is an integer number (1082908359).

Almost surely, 2^2165816717 is an apocalyptic number.

It is an amenable number.

2165816717 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165816717 is an equidigital number, since it uses as much as digits as its factorization.

2165816717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 2165816717 is about 46538.3359930284. The cubic root of 2165816717 is about 1293.8201200079.

The spelling of 2165816717 in words is "two billion, one hundred sixty-five million, eight hundred sixteen thousand, seven hundred seventeen".