18522965563 has 4 divisors (see below), whose sum is σ = 18953732248. Its totient is φ = 18092198880.

The previous prime is 18522965459. The next prime is 18522965611. The reversal of 18522965563 is 36556922581.

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 18522965563 - 2⁹ = 18522965051 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 18522965563.

It is not an unprimeable number, because it can be changed into a prime (18522905563) 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 3 ways as a sum of consecutive naturals, for example, 215383278 + ... + 215383363.

It is an arithmetic number, because the mean of its divisors is an integer number (4738433062).

Almost surely, 2^18522965563 is an apocalyptic number.

18522965563 is a deficient number, since it is larger than the sum of its proper divisors (430766685).

18522965563 is an equidigital number, since it uses as much as digits as its factorization.

18522965563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430766684.

The product of its digits is 3888000, while the sum is 52.

The spelling of 18522965563 in words is "eighteen billion, five hundred twenty-two million, nine hundred sixty-five thousand, five hundred sixty-three".