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a billion and 1
Perhaps you meant to add more to your question; in any event, 8.5 billion is a number. It is also an integer (a number without any decimal or fractional value in it). It is written out as 8,500,000,000. It can also be called 8 billion 5 hundred million.
A billion and one.
a billion and one
It is an incredibly large number that gives the impression of someone just trying to type a large number by hitting every number on the keyboard. It's somewhere on the order of 10 billion billion billion billion billion (by my count).