999,999
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999,999,999
1099
900,000,001. 900 million and one (when we talk whole numbers)
Ok first, 1 zillion is not a number, people just made that up. Second, the number that comes after on BILLION is two billion.
The whole number that comes just before 5646 is 5645. Whole numbers are integers that are greater than zero and do not have any decimal or fractional parts. In this case, 5645 is the whole number that immediately precedes 5646 in the number line.