9998199999 has 24 divisors (see below), whose sum is σ = 14736355920. Its totient is φ = 6529915392.

The previous prime is 9998199943. The next prime is 9998200013. The reversal of 9998199999 is 9999918999.

It is not a de Polignac number, because 9998199999 - 2⁹ = 9998199487 is a prime.

9998199999 is a modest number, since divided by 99999 gives 99981 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998199499) 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, 310447 + ... + 341135.

It is an arithmetic number, because the mean of its divisors is an integer number (614014830).

Almost surely, 2^9998199999 is an apocalyptic number.

9998199999 is a deficient number, since it is larger than the sum of its proper divisors (4738155921).

9998199999 is a wasteful number, since it uses less digits than its factorization.

9998199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31431 (or 31428 counting only the distinct ones).

The product of its digits is 344373768, while the sum is 81.

The square root of 9998199999 is about 99990.9995899631. Note that the first 3 decimals coincide. The cubic root of 9998199999 is about 2154.3054161219.

The spelling of 9998199999 in words is "nine billion, nine hundred ninety-eight million, one hundred ninety-nine thousand, nine hundred ninety-nine".