9999889999 has 24 divisors (see below), whose sum is σ = 11416124160. Its totient is φ = 8746290960.

The previous prime is 9999889993. The next prime is 9999890029.

9999889999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9999889999 - 2⁵ = 9999889967 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999889993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320632 + ... + 350434.

It is an arithmetic number, because the mean of its divisors is an integer number (475671840).

Almost surely, 2^9999889999 is an apocalyptic number.

9999889999 is a deficient number, since it is larger than the sum of its proper divisors (1416234161).

9999889999 is a wasteful number, since it uses less digits than its factorization.

9999889999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29931 (or 29920 counting only the distinct ones).

The product of its digits is 2754990144, while the sum is 88.

The square root of 9999889999 is about 99999.4499934875. The cubic root of 9999889999 is about 2154.4267903372.

It can be divided in two parts, 9999 and 889999, that added together give a palindrome (899998).

The spelling of 9999889999 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-nine thousand, nine hundred ninety-nine".