18196816338 has 24 divisors (see below), whose sum is σ = 39447380700. Its totient is φ = 6062383104.

The previous prime is 18196816331. The next prime is 18196816369. The reversal of 18196816338 is 83361869181.

It can be written as a sum of positive squares in 2 ways, for example, as 16095235689 + 2101580649 = 126867^2 + 45843^2 .

It is a super-2 number, since 2×18196816338² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18196816331) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 233583 + ... + 301586.

Almost surely, 2^18196816338 is an apocalyptic number.

18196816338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18196816338 is an abundant number, since it is smaller than the sum of its proper divisors (21250564362).

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

18196816338 is a wasteful number, since it uses less digits than its factorization.

18196816338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537066 (or 537063 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 18196816338 in words is "eighteen billion, one hundred ninety-six million, eight hundred sixteen thousand, three hundred thirty-eight".