18181818180 has 144 divisors (see below), whose sum is σ = 56711386368. Its totient is φ = 4712256000.

The previous prime is 18181818119. The next prime is 18181818209. The reversal of 18181818180 is 8181818181.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1995435 + ... + 2004525.

It is an arithmetic number, because the mean of its divisors is an integer number (393829072).

Almost surely, 2^18181818180 is an apocalyptic number.

18181818180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18181818180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28355693184).

18181818180 is an abundant number, since it is smaller than the sum of its proper divisors (38529568188).

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

18181818180 is a wasteful number, since it uses less digits than its factorization.

18181818180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9418 (or 9413 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 45.

18181818180 divided by its sum of digits (45) gives a palindrome (404040404).

Subtracting from 18181818180 its reverse (8181818181), we obtain a palindrome (9999999999).

The spelling of 18181818180 in words is "eighteen billion, one hundred eighty-one million, eight hundred eighteen thousand, one hundred eighty".