165500 has 24 divisors (see below), whose sum is σ = 362544. Its totient is φ = 66000.

The previous prime is 165479. The next prime is 165511. The reversal of 165500 is 5561.

165500 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.

165500 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (15106).

2¹⁶⁵⁵⁰⁰ is an apocalyptic number.

165500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181272).

165500 is an abundant number, since it is smaller than the sum of its proper divisors (197044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165500 is a wasteful number, since it uses less digits than its factorization.

165500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 165500 is about 406.8169121362. The cubic root of 165500 is about 54.9034117430.

The spelling of 165500 in words is "one hundred sixty-five thousand, five hundred".