165623361599 has 2 divisors, whose sum is σ = 165623361600. Its totient is φ = 165623361598.

The previous prime is 165623361587. The next prime is 165623361619. The reversal of 165623361599 is 995163326561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165623361599 - 2²⁰ = 165622313023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165623361199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82811680799 + 82811680800.

It is an arithmetic number, because the mean of its divisors is an integer number (82811680800).

Almost surely, 2^165623361599 is an apocalyptic number.

165623361599 is a deficient number, since it is larger than the sum of its proper divisors (1).

165623361599 is an equidigital number, since it uses as much as digits as its factorization.

165623361599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 56.

The spelling of 165623361599 in words is "one hundred sixty-five billion, six hundred twenty-three million, three hundred sixty-one thousand, five hundred ninety-nine".