Numbers bigger than 999,999,999,999,999 include 1 quadrillion (1,000,000,000,000,000), 1 quintillion (1,000,000,000,000,000,000), and so on. These numbers follow the pattern of increasing by a factor of 1,000 for each new set of three zeros added. The terms for these numbers are based on the Latin numerical prefixes, with "quad" representing four and "quin" representing five, indicating the number of groups of three zeros in the number.
1,000,000,000,000,000
1,000,000,000,000,000
999999999999999
99,999,999,999,999 + 999,999,999,999,999 = 1,099,999,999,999,998
1,000,000,000,000,000
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
1,000,000,000,000,000
1,000,000,000,000,000
999999999999999
1000000000000000
One quadrillion.
999999999999999
99999999999999
99,999,999,999,999 + 999,999,999,999,999 = 1,099,999,999,999,998
1,000,000,000,000,000