18215026208 has 96 divisors (see below), whose sum is σ = 37725004800. Its totient is φ = 8645704704.

The previous prime is 18215026189. The next prime is 18215026241. The reversal of 18215026208 is 80262051281.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26905166 + ... + 26905842.

It is an arithmetic number, because the mean of its divisors is an integer number (392968800).

Almost surely, 2^18215026208 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 18215026208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18862502400).

18215026208 is an abundant number, since it is smaller than the sum of its proper divisors (19509978592).

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

18215026208 is a wasteful number, since it uses less digits than its factorization.

18215026208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

Adding to 18215026208 its reverse (80262051281), we get a palindrome (98477077489).

The spelling of 18215026208 in words is "eighteen billion, two hundred fifteen million, twenty-six thousand, two hundred eight".