165550 has 48 divisors (see below), whose sum is σ = 392832. Its totient is φ = 50400.

The previous prime is 165541. The next prime is 165551. The reversal of 165550 is 55561.

165550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3829 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (8184).

2¹⁶⁵⁵⁵⁰ is an apocalyptic number.

165550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165550 is an abundant number, since it is smaller than the sum of its proper divisors (227282).

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

165550 is a wasteful number, since it uses less digits than its factorization.

165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 165550 is about 406.8783602012. The cubic root of 165550 is about 54.9089402308.

The spelling of 165550 in words is "one hundred sixty-five thousand, five hundred fifty".