9979886889 has 18 divisors (see below), whose sum is σ = 16768926330. Its totient is φ = 5702792256.

The previous prime is 9979886863. The next prime is 9979886951. The reversal of 9979886889 is 9886889799.

It is a happy number.

9979886889 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 only one way, i.e., 7540317225 + 2439569664 = 86835^2 + 49392^2 .

It is not a de Polignac number, because 9979886889 - 2¹³ = 9979878697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9979886809) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11314624 + ... + 11315505.

Almost surely, 2^9979886889 is an apocalyptic number.

It is an amenable number.

9979886889 is a deficient number, since it is larger than the sum of its proper divisors (6789039441).

9979886889 is a wasteful number, since it uses less digits than its factorization.

9979886889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22630149 (or 22630139 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 81.

The square root of 9979886889 is about 99899.3838269286. The cubic root of 9979886889 is about 2152.9893077584.

The spelling of 9979886889 in words is "nine billion, nine hundred seventy-nine million, eight hundred eighty-six thousand, eight hundred eighty-nine".