18201818208 has 192 divisors, whose sum is σ = 57576960000. Its totient is φ = 4918454784.

The previous prime is 18201818203. The next prime is 18201818233. The reversal of 18201818208 is 80281810281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201818203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13009893 + ... + 13011291.

It is an arithmetic number, because the mean of its divisors is an integer number (299880000).

Almost surely, 2^18201818208 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 18201818208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28788480000).

18201818208 is an abundant number, since it is smaller than the sum of its proper divisors (39375141792).

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

18201818208 is a wasteful number, since it uses less digits than its factorization.

18201818208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457 (or 2449 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 39.

The spelling of 18201818208 in words is "eighteen billion, two hundred one million, eight hundred eighteen thousand, two hundred eight".