18555922608 has 80 divisors (see below), whose sum is σ = 49257371136. Its totient is φ = 6016446720.

The previous prime is 18555922607. The next prime is 18555922621. The reversal of 18555922608 is 80622955581.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18555922607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342498 + ... + 392958.

Almost surely, 2^18555922608 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 18555922608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24628685568).

18555922608 is an abundant number, since it is smaller than the sum of its proper divisors (30701448528).

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

18555922608 is a wasteful number, since it uses less digits than its factorization.

18555922608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50682 (or 50676 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 51.

The spelling of 18555922608 in words is "eighteen billion, five hundred fifty-five million, nine hundred twenty-two thousand, six hundred eight".