9988832821806 has 20 divisors (see below), whose sum is σ = 22382384656632. Its totient is φ = 3329610940548.

The previous prime is 9988832821789. The next prime is 9988832821841. The reversal of 9988832821806 is 6081282388899.

It is a happy number.

9988832821806 is a `hidden beast` number, since 9 + 9 + 8 + 88 + 328 + 218 + 0 + 6 = 666.

It is a super-2 number, since 2×9988832821806² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30829730770 + ... + 30829731093.

Almost surely, 2^{9988832821806} is an apocalyptic number.

9988832821806 is an abundant number, since it is smaller than the sum of its proper divisors (12393551834826).

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

9988832821806 is a wasteful number, since it uses less digits than its factorization.

9988832821806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61659461877 (or 61659461868 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 72.

The spelling of 9988832821806 in words is "nine trillion, nine hundred eighty-eight billion, eight hundred thirty-two million, eight hundred twenty-one thousand, eight hundred six".