2165819647 has 2 divisors, whose sum is σ = 2165819648. Its totient is φ = 2165819646.

The previous prime is 2165819641. The next prime is 2165819653. The reversal of 2165819647 is 7469185612.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2165819641) and next prime (2165819653).

It is a cyclic number.

It is not a de Polignac number, because 2165819647 - 2³ = 2165819639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165819647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165819641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082909823 + 1082909824.

It is an arithmetic number, because the mean of its divisors is an integer number (1082909824).

Almost surely, 2^2165819647 is an apocalyptic number.

2165819647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165819647 is an equidigital number, since it uses as much as digits as its factorization.

2165819647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 2165819647 is about 46538.3674724415. The cubic root of 2165819647 is about 1293.8207034508.

The spelling of 2165819647 in words is "two billion, one hundred sixty-five million, eight hundred nineteen thousand, six hundred forty-seven".