165000503 has 16 divisors (see below), whose sum is σ = 181547520. Its totient is φ = 149397696.

The previous prime is 165000481. The next prime is 165000529. The reversal of 165000503 is 305000561.

It is a cyclic number.

It is not a de Polignac number, because 165000503 - 2⁶ = 165000439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165000553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36251 + ... + 40547.

It is an arithmetic number, because the mean of its divisors is an integer number (11346720).

Almost surely, 2^165000503 is an apocalyptic number.

165000503 is a deficient number, since it is larger than the sum of its proper divisors (16547017).

165000503 is a wasteful number, since it uses less digits than its factorization.

165000503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 165000503 is about 12845.2521578987. The cubic root of 165000503 is about 548.4812125877.

The spelling of 165000503 in words is "one hundred sixty-five million, five hundred three", and thus it is an aban number.