165598 has 4 divisors (see below), whose sum is σ = 248400. Its totient is φ = 82798.

The previous prime is 165589. The next prime is 165601. The reversal of 165598 is 895561.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41398 + ... + 41401.

It is an arithmetic number, because the mean of its divisors is an integer number (62100).

2¹⁶⁵⁵⁹⁸ is an apocalyptic number.

165598 is a deficient number, since it is larger than the sum of its proper divisors (82802).

165598 is an equidigital number, since it uses as much as digits as its factorization.

165598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82801.

The product of its digits is 10800, while the sum is 34.

The square root of 165598 is about 406.9373416142. The cubic root of 165598 is about 54.9142465319.

The spelling of 165598 in words is "one hundred sixty-five thousand, five hundred ninety-eight".