18209672208 has 400 divisors, whose sum is σ = 65991192960. Its totient is φ = 4719347712.

The previous prime is 18209672189. The next prime is 18209672209. The reversal of 18209672208 is 80227690281.

It is not an unprimeable number, because it can be changed into a prime (18209672209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6956916 + ... + 6959532.

Almost surely, 2^18209672208 is an apocalyptic number.

18209672208 is a gapful number since it is divisible by the number (18) 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 18209672208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32995596480).

18209672208 is an abundant number, since it is smaller than the sum of its proper divisors (47781520752).

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

18209672208 is a wasteful number, since it uses less digits than its factorization.

18209672208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 18209672208 in words is "eighteen billion, two hundred nine million, six hundred seventy-two thousand, two hundred eight".