18063565 has 12 divisors (see below), whose sum is σ = 23473044. Its totient is φ = 13338624.

The previous prime is 18063553. The next prime is 18063599. The reversal of 18063565 is 56536081.

It can be written as a sum of positive squares in 6 ways, for example, as 7912969 + 10150596 = 2813^2 + 3186^2 .

It is not a de Polignac number, because 18063565 - 2¹⁷ = 17932493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18063565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9844 + ... + 11533.

It is an arithmetic number, because the mean of its divisors is an integer number (1956087).

Almost surely, 2^18063565 is an apocalyptic number.

It is an amenable number.

18063565 is a deficient number, since it is larger than the sum of its proper divisors (5409479).

18063565 is a wasteful number, since it uses less digits than its factorization.

18063565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21408 (or 21395 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 18063565 is about 4250.1252922708. The cubic root of 18063565 is about 262.3822722274.

The spelling of 18063565 in words is "eighteen million, sixty-three thousand, five hundred sixty-five".