19821801963636 has 48 divisors (see below), whose sum is σ = 51457743359680. Its totient is φ = 6598539067680.

The previous prime is 19821801963619. The next prime is 19821801963643. The reversal of 19821801963636 is 63636910812891.

19821801963636 is a `hidden beast` number, since 1 + 9 + 8 + 2 + 1 + 80 + 196 + 363 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121143610 + ... + 121307121.

Almost surely, 2^{19821801963636} is an apocalyptic number.

It is an amenable number.

19821801963636 is an abundant number, since it is smaller than the sum of its proper divisors (31635941396044).

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

19821801963636 is a wasteful number, since it uses less digits than its factorization.

19821801963636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242451501 (or 242451493 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 19821801963636 in words is "nineteen trillion, eight hundred twenty-one billion, eight hundred one million, nine hundred sixty-three thousand, six hundred thirty-six".