18818115888 has 320 divisors, whose sum is σ = 60441131520. Its totient is φ = 4960051200.

The previous prime is 18818115851. The next prime is 18818115889. The reversal of 18818115888 is 88851181881.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (18818115889) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40819978 + ... + 40820438.

It is an arithmetic number, because the mean of its divisors is an integer number (188878536).

Almost surely, 2^18818115888 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 18818115888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30220565760).

18818115888 is an abundant number, since it is smaller than the sum of its proper divisors (41623015632).

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

18818115888 is a wasteful number, since it uses less digits than its factorization.

18818115888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 822 counting only the distinct ones).

The product of its digits is 1310720, while the sum is 57.

The spelling of 18818115888 in words is "eighteen billion, eight hundred eighteen million, one hundred fifteen thousand, eight hundred eighty-eight".