165815963 has 2 divisors, whose sum is σ = 165815964. Its totient is φ = 165815962.

The previous prime is 165815933. The next prime is 165816017. The reversal of 165815963 is 369518561.

165815963 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 is an emirp because it is prime and its reverse (369518561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165815963 - 2¹⁶ = 165750427 is a prime.

It is not a weakly prime, because it can be changed into another prime (165815933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82907981 + 82907982.

It is an arithmetic number, because the mean of its divisors is an integer number (82907982).

Almost surely, 2^165815963 is an apocalyptic number.

165815963 is a deficient number, since it is larger than the sum of its proper divisors (1).

165815963 is an equidigital number, since it uses as much as digits as its factorization.

165815963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 165815963 is about 12876.9547253999. The cubic root of 165815963 is about 549.3832900144.

The spelling of 165815963 in words is "one hundred sixty-five million, eight hundred fifteen thousand, nine hundred sixty-three".