Best Answer

A US Billion* has 9 digits following the leading digits (64 being the leading digits in this case.)

So 64.1 billion dollars = $64,100,000,000

Notice that if you count the number of digits after 64 there are 9

Note*: A billion in some other countries is actually a million million (or having 12 digits after the leading digits.) For finance this magnitude of number does not make sense (it's much too large,) and instead the US Billion is used.

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Q: How do you write 64.1 billion dollars?
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