9899808899 has 4 divisors (see below), whose sum is σ = 9900918000. Its totient is φ = 9898699800.

The previous prime is 9899808881. The next prime is 9899808907. The reversal of 9899808899 is 9988089989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9988089989 = 149 ⋅67034161.

It is a cyclic number.

It is not a de Polignac number, because 9899808899 - 2⁸ = 9899808643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9899808829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541052 + ... + 559049.

It is an arithmetic number, because the mean of its divisors is an integer number (2475229500).

Almost surely, 2^9899808899 is an apocalyptic number.

9899808899 is a deficient number, since it is larger than the sum of its proper divisors (1109101).

9899808899 is a wasteful number, since it uses less digits than its factorization.

9899808899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109100.

The product of its (nonzero) digits is 241864704, while the sum is 77.

The square root of 9899808899 is about 99497.7833873700. The cubic root of 9899808899 is about 2147.2153528478.

The spelling of 9899808899 in words is "nine billion, eight hundred ninety-nine million, eight hundred eight thousand, eight hundred ninety-nine".