165590 has 16 divisors (see below), whose sum is σ = 308880. Its totient is φ = 63840.

The previous prime is 165589. The next prime is 165601. The reversal of 165590 is 95561.

165590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5 + ... + 575.

It is an arithmetic number, because the mean of its divisors is an integer number (19305).

2¹⁶⁵⁵⁹⁰ is an apocalyptic number.

165590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165590 is a deficient number, since it is larger than the sum of its proper divisors (143290).

165590 is a wasteful number, since it uses less digits than its factorization.

165590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 165590 is about 406.9275119723. The cubic root of 165590 is about 54.9133622196.

The spelling of 165590 in words is "one hundred sixty-five thousand, five hundred ninety".