165445803 has 12 divisors (see below), whose sum is σ = 239089968. Its totient is φ = 110245200.

The previous prime is 165445801. The next prime is 165445823. The reversal of 165445803 is 308544561.

It is a happy number.

It is not a de Polignac number, because 165445803 - 2¹ = 165445801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165445801) 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 11 ways as a sum of consecutive naturals, for example, 30826 + ... + 35792.

It is an arithmetic number, because the mean of its divisors is an integer number (19924164).

Almost surely, 2^165445803 is an apocalyptic number.

165445803 is a deficient number, since it is larger than the sum of its proper divisors (73644165).

165445803 is a wasteful number, since it uses less digits than its factorization.

165445803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8674 (or 8671 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 165445803 is about 12862.5737315671. The cubic root of 165445803 is about 548.9741793623.

The spelling of 165445803 in words is "one hundred sixty-five million, four hundred forty-five thousand, eight hundred three".