198018199836 has 144 divisors (see below), whose sum is σ = 517333235328. Its totient is φ = 63828864000.

The previous prime is 198018199829. The next prime is 198018199871. The reversal of 198018199836 is 638991810891.

It is a super-2 number, since 2×198018199836² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 112958736 + ... + 112960488.

It is an arithmetic number, because the mean of its divisors is an integer number (3592591912).

Almost surely, 2^198018199836 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 198018199836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258666617664).

198018199836 is an abundant number, since it is smaller than the sum of its proper divisors (319315035492).

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

198018199836 is a wasteful number, since it uses less digits than its factorization.

198018199836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 63.

The spelling of 198018199836 in words is "one hundred ninety-eight billion, eighteen million, one hundred ninety-nine thousand, eight hundred thirty-six".