1998218018196 has 24 divisors (see below), whose sum is σ = 5180565232640. Its totient is φ = 666072672696.

The previous prime is 1998218018191. The next prime is 1998218018207. The reversal of 1998218018196 is 6918108128991.

1998218018196 is a `hidden beast` number, since 199 + 8 + 2 + 180 + 181 + 96 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998218018191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9251009236 + ... + 9251009451.

Almost surely, 2^{1998218018196} is an apocalyptic number.

It is an amenable number.

1998218018196 is an abundant number, since it is smaller than the sum of its proper divisors (3182347214444).

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

1998218018196 is a wasteful number, since it uses less digits than its factorization.

1998218018196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18502018700 (or 18502018692 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 63.

The spelling of 1998218018196 in words is "one trillion, nine hundred ninety-eight billion, two hundred eighteen million, eighteen thousand, one hundred ninety-six".