999998499899 has 6 divisors (see below), whose sum is σ = 1163263561164. Its totient is φ = 857141571300.

The previous prime is 999998499893. The next prime is 999998499959. The reversal of 999998499899 is 998994899999.

999998499899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999998499899 - 2⁴ = 999998499883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999998499799 and 999998499808.

It is not an unprimeable number, because it can be changed into a prime (999998499893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10204066277 + ... + 10204066374.

It is an arithmetic number, because the mean of its divisors is an integer number (193877260194).

Almost surely, 2^999998499899 is an apocalyptic number.

999998499899 is a deficient number, since it is larger than the sum of its proper divisors (163265061265).

999998499899 is a wasteful number, since it uses less digits than its factorization.

999998499899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20408132665 (or 20408132658 counting only the distinct ones).

The product of its digits is 99179645184, while the sum is 101.

The spelling of 999998499899 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, four hundred ninety-nine thousand, eight hundred ninety-nine".