9982820195891 has 4 divisors (see below), whose sum is σ = 9982830570912. Its totient is φ = 9982809820872.

The previous prime is 9982820195879. The next prime is 9982820195911. The reversal of 9982820195891 is 1985910282899.

9982820195891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9982820195891 - 2¹⁸ = 9982819933747 is a prime.

It is a super-2 number, since 2×9982820195891² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9982820165891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3577691 + ... + 5724116.

It is an arithmetic number, because the mean of its divisors is an integer number (2495707642728).

Almost surely, 2^{9982820195891} is an apocalyptic number.

9982820195891 is a deficient number, since it is larger than the sum of its proper divisors (10375021).

9982820195891 is a wasteful number, since it uses less digits than its factorization.

9982820195891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10375020.

The product of its (nonzero) digits is 67184640, while the sum is 71.

The spelling of 9982820195891 in words is "nine trillion, nine hundred eighty-two billion, eight hundred twenty million, one hundred ninety-five thousand, eight hundred ninety-one".