165135399 has 32 divisors (see below), whose sum is σ = 273901824. Its totient is φ = 86945280.

The previous prime is 165135361. The next prime is 165135401. The reversal of 165135399 is 993531561.

It is not a de Polignac number, because 165135399 - 2²⁷ = 30917671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165135399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165135319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4029 + ... + 18614.

It is an arithmetic number, because the mean of its divisors is an integer number (8559432).

Almost surely, 2^165135399 is an apocalyptic number.

165135399 is a deficient number, since it is larger than the sum of its proper divisors (108766425).

165135399 is a wasteful number, since it uses less digits than its factorization.

165135399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22687.

The product of its digits is 109350, while the sum is 42.

The square root of 165135399 is about 12850.5018968132. The cubic root of 165135399 is about 548.6306419663.

It can be divided in two parts, 16513 and 5399, that added together give a palindrome (21912).

The spelling of 165135399 in words is "one hundred sixty-five million, one hundred thirty-five thousand, three hundred ninety-nine".