18563245009 has 3 divisors (see below), whose sum is σ = 18563381257. Its totient is φ = 18563108762.

The previous prime is 18563244991. The next prime is 18563245021. The reversal of 18563245009 is 90054236581.

The square root of 18563245009 is 136247.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18563245009 - 2⁵ = 18563244977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18563245069) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 68124 + ... + 204370.

Almost surely, 2^18563245009 is an apocalyptic number.

18563245009 is the 136247-th square number.

18563245009 is the 68124-th centered octagonal number.

It is an amenable number.

18563245009 is a deficient number, since it is larger than the sum of its proper divisors (136248).

18563245009 is an frugal number, since it uses more digits than its factorization.

18563245009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272494 (or 136247 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 18563245009 in words is "eighteen billion, five hundred sixty-three million, two hundred forty-five thousand, nine".