165403163 has 4 divisors (see below), whose sum is σ = 165558960. Its totient is φ = 165247368.

The previous prime is 165403127. The next prime is 165403171. The reversal of 165403163 is 361304561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165403163 - 2¹⁸ = 165141019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165403193) 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 3 ways as a sum of consecutive naturals, for example, 76295 + ... + 78432.

It is an arithmetic number, because the mean of its divisors is an integer number (41389740).

Almost surely, 2^165403163 is an apocalyptic number.

165403163 is a deficient number, since it is larger than the sum of its proper divisors (155797).

165403163 is a wasteful number, since it uses less digits than its factorization.

165403163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155796.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 165403163 is about 12860.9161026732. The cubic root of 165403163 is about 548.9270133219.

The spelling of 165403163 in words is "one hundred sixty-five million, four hundred three thousand, one hundred sixty-three".