165393963 has 18 divisors (see below), whose sum is σ = 277907604. Its totient is φ = 94510584.

The previous prime is 165393947. The next prime is 165394007. The reversal of 165393963 is 369393561.

It is not a de Polignac number, because 165393963 - 2⁴ = 165393947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165393923) 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, 187081 + ... + 187962.

Almost surely, 2^165393963 is an apocalyptic number.

165393963 is a deficient number, since it is larger than the sum of its proper divisors (112513641).

165393963 is a wasteful number, since it uses less digits than its factorization.

165393963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375063 (or 375053 counting only the distinct ones).

The product of its digits is 393660, while the sum is 45.

The square root of 165393963 is about 12860.5584248896. The cubic root of 165393963 is about 548.9168357210.

It can be divided in two parts, 16539 and 3963, that added together give a palindrome (20502).

The spelling of 165393963 in words is "one hundred sixty-five million, three hundred ninety-three thousand, nine hundred sixty-three".