165040203 has 16 divisors (see below), whose sum is σ = 229971456. Its totient is φ = 105082560.

The previous prime is 165040177. The next prime is 165040207. The reversal of 165040203 is 302040561.

It is a happy number.

It is not a de Polignac number, because 165040203 - 2²² = 160845899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165040203.

It is not an unprimeable number, because it can be changed into a prime (165040207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57738 + ... + 60528.

It is an arithmetic number, because the mean of its divisors is an integer number (14373216).

Almost surely, 2^165040203 is an apocalyptic number.

165040203 is a deficient number, since it is larger than the sum of its proper divisors (64931253).

165040203 is a wasteful number, since it uses less digits than its factorization.

165040203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 165040203 is about 12846.7973830056. The cubic root of 165040203 is about 548.5251982273.

Adding to 165040203 its reverse (302040561), we get a palindrome (467080764).

The spelling of 165040203 in words is "one hundred sixty-five million, forty thousand, two hundred three".