165403645 has 32 divisors (see below), whose sum is σ = 230791680. Its totient is φ = 112530240.

The previous prime is 165403627. The next prime is 165403663. The reversal of 165403645 is 546304561.

It is an interprime number because it is at equal distance from previous prime (165403627) and next prime (165403663).

It is not a de Polignac number, because 165403645 - 2¹¹ = 165401597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165403645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85782 + ... + 87688.

It is an arithmetic number, because the mean of its divisors is an integer number (7212240).

Almost surely, 2^165403645 is an apocalyptic number.

It is an amenable number.

165403645 is a deficient number, since it is larger than the sum of its proper divisors (65388035).

165403645 is a wasteful number, since it uses less digits than its factorization.

165403645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 165403645 is about 12860.9348416046. The cubic root of 165403645 is about 548.9275465293.

The spelling of 165403645 in words is "one hundred sixty-five million, four hundred three thousand, six hundred forty-five".