99999989999 has 16 divisors (see below), whose sum is σ = 127047137280. Its totient is φ = 76568582880.

The previous prime is 99999989983. The next prime is 99999990017. The reversal of 99999989999 is 99998999999.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 99999989999 - 2⁴ = 99999989983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999980999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17721389 + ... + 17727030.

It is an arithmetic number, because the mean of its divisors is an integer number (7940446080).

Almost surely, 2^99999989999 is an apocalyptic number.

99999989999 is a deficient number, since it is larger than the sum of its proper divisors (27047147281).

99999989999 is a wasteful number, since it uses less digits than its factorization.

99999989999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35448470.

The product of its digits is 27894275208, while the sum is 98.

The spelling of 99999989999 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred eighty-nine thousand, nine hundred ninety-nine".