165623369 has 2 divisors, whose sum is σ = 165623370. Its totient is φ = 165623368.

The previous prime is 165623327. The next prime is 165623389. The reversal of 165623369 is 963326561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 3952144 = 12715^2 + 1988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165623369 is a prime.

It is a super-2 number, since 2×165623369² = 54862200717820322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (165623389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82811684 + 82811685.

It is an arithmetic number, because the mean of its divisors is an integer number (82811685).

Almost surely, 2^165623369 is an apocalyptic number.

It is an amenable number.

165623369 is a deficient number, since it is larger than the sum of its proper divisors (1).

165623369 is an equidigital number, since it uses as much as digits as its factorization.

165623369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 41.

The square root of 165623369 is about 12869.4743093881. The cubic root of 165623369 is about 549.1705060843.

The spelling of 165623369 in words is "one hundred sixty-five million, six hundred twenty-three thousand, three hundred sixty-nine".