9998806689 has 12 divisors (see below), whose sum is σ = 14471102100. Its totient is φ = 6652772064.

The previous prime is 9998806663. The next prime is 9998806691. The reversal of 9998806689 is 9866088999.

9998806689 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6627262464 + 3371544225 = 81408^2 + 58065^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9998806689 is a prime.

It is a super-2 number, since 2×9998806689² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9998806189) 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 in 11 ways as a sum of consecutive naturals, for example, 1086754 + ... + 1095915.

It is an arithmetic number, because the mean of its divisors is an integer number (1205925175).

Almost surely, 2^9998806689 is an apocalyptic number.

It is an amenable number.

9998806689 is a deficient number, since it is larger than the sum of its proper divisors (4472295411).

9998806689 is a wasteful number, since it uses less digits than its factorization.

9998806689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183184 (or 2183181 counting only the distinct ones).

The product of its (nonzero) digits is 120932352, while the sum is 72.

The square root of 9998806689 is about 99994.0332669905. The cubic root of 9998806689 is about 2154.3489896024.

The spelling of 9998806689 in words is "nine billion, nine hundred ninety-eight million, eight hundred six thousand, six hundred eighty-nine".