9988832821789 has 2 divisors, whose sum is σ = 9988832821790. Its totient is φ = 9988832821788.

The previous prime is 9988832821757. The next prime is 9988832821841. The reversal of 9988832821789 is 9871282388899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9815168928889 + 173663892900 = 3132917^2 + 416730^2 .

It is a cyclic number.

It is not a de Polignac number, because 9988832821789 - 2⁵ = 9988832821757 is a prime.

It is a super-2 number, since 2×9988832821789² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9988832821729) by changing a digit.

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 as a sum of consecutive naturals, namely, 4994416410894 + 4994416410895.

It is an arithmetic number, because the mean of its divisors is an integer number (4994416410895).

Almost surely, 2^{9988832821789} is an apocalyptic number.

It is an amenable number.

9988832821789 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988832821789 is an equidigital number, since it uses as much as digits as its factorization.

9988832821789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2006581248, while the sum is 82.

The spelling of 9988832821789 in words is "nine trillion, nine hundred eighty-eight billion, eight hundred thirty-two million, eight hundred twenty-one thousand, seven hundred eighty-nine".