198019819999836 has 18 divisors (see below), whose sum is σ = 500550100555232. Its totient is φ = 66006606666600.

The previous prime is 198019819999811. The next prime is 198019819999867. The reversal of 198019819999836 is 638999918910891.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×198019819999836² (a number of 29 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 5 ways as a sum of consecutive naturals, for example, 2750275277740 + ... + 2750275277811.

Almost surely, 2^{198019819999836} is an apocalyptic number.

It is an amenable number.

198019819999836 is an abundant number, since it is smaller than the sum of its proper divisors (302530280555396).

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

198019819999836 is a wasteful number, since it uses less digits than its factorization.

198019819999836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500550555561 (or 5500550555556 counting only the distinct ones).

The product of its (nonzero) digits is 4897760256, while the sum is 90.

The spelling of 198019819999836 in words is "one hundred ninety-eight trillion, nineteen billion, eight hundred nineteen million, nine hundred ninety-nine thousand, eight hundred thirty-six".