Oh, isn't that just a happy little question! There are numbers bigger than 999,999,999,999, like 1,000,000,000,000 or even infinity. Just imagine all the possibilities and beauty in numbers, each one unique and special in its own way. Keep exploring and discovering, my friend, and remember, there are no mistakes in math, just happy little accidents.
1,000,000,000,000,000
999999999999999
1,000,000,000,000,000
one quadrillion
99,999,999,999,999 + 999,999,999,999,999 = 1,099,999,999,999,998
The result of multiplying 999999999999999 by 3 is 2,999,999,999,999,997.
Assuming your number line is infinite, then it is: n > 999999999999999 where n = 1000000000000000, 1000000000000001, 1000000000000002, ... and so on. If your number line is finite, then it is: 999999999999999 < n
1,000,000,000,000,000
999999999999999
1000000000000000
1,000,000,000,000,000
1,000,000,000,000,000
One quadrillion.
99999999999999
999999999999999
one quadrillion
99,999,999,999,999 + 999,999,999,999,999 = 1,099,999,999,999,998