18123565568 has 80 divisors (see below), whose sum is σ = 38457270720. Its totient is φ = 8508358656.

The previous prime is 18123565531. The next prime is 18123565583. The reversal of 18123565568 is 86556532181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1091021 + ... + 1107507.

It is an arithmetic number, because the mean of its divisors is an integer number (480715884).

Almost surely, 2^18123565568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18123565568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19228635360).

18123565568 is an abundant number, since it is smaller than the sum of its proper divisors (20333705152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18123565568 is a wasteful number, since it uses less digits than its factorization.

18123565568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16637 (or 16621 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 50.

The spelling of 18123565568 in words is "eighteen billion, one hundred twenty-three million, five hundred sixty-five thousand, five hundred sixty-eight".