165359599 has 4 divisors (see below), whose sum is σ = 166965136. Its totient is φ = 163754064.

The previous prime is 165359573. The next prime is 165359617. The reversal of 165359599 is 995953561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 995953561 = 173 ⋅5756957.

It is a cyclic number.

It is not a de Polignac number, because 165359599 - 2²¹ = 163262447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165359539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 802614 + ... + 802819.

It is an arithmetic number, because the mean of its divisors is an integer number (41741284).

Almost surely, 2^165359599 is an apocalyptic number.

165359599 is a deficient number, since it is larger than the sum of its proper divisors (1605537).

165359599 is a wasteful number, since it uses less digits than its factorization.

165359599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605536.

The product of its digits is 1640250, while the sum is 52.

The square root of 165359599 is about 12859.2223326296. Note that the first 3 decimals coincide. The cubic root of 165359599 is about 548.8788168309.

The spelling of 165359599 in words is "one hundred sixty-five million, three hundred fifty-nine thousand, five hundred ninety-nine".