165318503 has 18 divisors (see below), whose sum is σ = 201195864. Its totient is φ = 135186744.

The previous prime is 165318499. The next prime is 165318521. The reversal of 165318503 is 305813561.

It is not a de Polignac number, because 165318503 - 2² = 165318499 is a prime.

It is a super-2 number, since 2×165318503² = 54660414868322018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165318503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165318583) 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 17 ways as a sum of consecutive naturals, for example, 431450 + ... + 431832.

It is an arithmetic number, because the mean of its divisors is an integer number (11177548).

Almost surely, 2^165318503 is an apocalyptic number.

165318503 is a deficient number, since it is larger than the sum of its proper divisors (35877361).

165318503 is an frugal number, since it uses more digits than its factorization.

165318503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165318503 is about 12857.6243140014. The cubic root of 165318503 is about 548.8333430214.

The spelling of 165318503 in words is "one hundred sixty-five million, three hundred eighteen thousand, five hundred three".