Nothing it is the highest named number. if you want to invent a new one call the world numbewr society or something
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Trillquadquintsexsepoctnondecundecduo...That's the highest number known to mankind
699 comes before and 701 comes after
999000000000001 comes after 999000000000000.
10 10 comes after 9
a tillion is the unit that comes after nonillion