9988778899 has 4 divisors (see below), whose sum is σ = 10896849720. Its totient is φ = 9080708080.

The previous prime is 9988778897. The next prime is 9988778903.

9988778899 is nontrivially palindromic in base 10.

9988778899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9988778899 - 2¹ = 9988778897 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9988778897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454035394 + ... + 454035415.

It is an arithmetic number, because the mean of its divisors is an integer number (2724212430).

Almost surely, 2^9988778899 is an apocalyptic number.

9988778899 is a deficient number, since it is larger than the sum of its proper divisors (908070821).

9988778899 is a wasteful number, since it uses less digits than its factorization.

9988778899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908070820.

The product of its digits is 1316818944, while the sum is 82.

The square root of 9988778899 is about 99943.8787470248. The cubic root of 9988778899 is about 2153.6285507892.

It can be divided in two parts, 9988 and 778899, that added together give a palindrome (788887).

The spelling of 9988778899 in words is "nine billion, nine hundred eighty-eight million, seven hundred seventy-eight thousand, eight hundred ninety-nine".