165003 has 4 divisors (see below), whose sum is σ = 220008. Its totient is φ = 110000.

The previous prime is 165001. The next prime is 165037. The reversal of 165003 is 300561.

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

It is a cyclic number.

It is not a de Polignac number, because 165003 - 2¹ = 165001 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (165001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27498 + ... + 27503.

It is an arithmetic number, because the mean of its divisors is an integer number (55002).

2¹⁶⁵⁰⁰³ is an apocalyptic number.

165003 is a deficient number, since it is larger than the sum of its proper divisors (55005).

165003 is an equidigital number, since it uses as much as digits as its factorization.

165003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55004.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 165003 is about 406.2056129597. The cubic root of 165003 is about 54.8483979348.

Adding to 165003 its reverse (300561), we get a palindrome (465564).

The spelling of 165003 in words is "one hundred sixty-five thousand, three".