165003563 has 6 divisors (see below), whose sum is σ = 165908652. Its totient is φ = 164103380.

The previous prime is 165003551. The next prime is 165003569. The reversal of 165003563 is 365300561.

165003563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-165003563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165003569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34220 + ... + 38742.

It is an arithmetic number, because the mean of its divisors is an integer number (27651442).

Almost surely, 2^165003563 is an apocalyptic number.

165003563 is a deficient number, since it is larger than the sum of its proper divisors (905089).

165003563 is an frugal number, since it uses more digits than its factorization.

165003563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905 (or 4714 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 165003563 is about 12845.3712675033. The cubic root of 165003563 is about 548.4846031675.

The spelling of 165003563 in words is "one hundred sixty-five million, three thousand, five hundred sixty-three".