You need to specify what unit the 1 billion is.
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None. 1000000000 is a pure number: it has no physical presence and therefore no length.
There are 63360 inches in one mile. Therefore, 1,000,000,000 inches is equal to 1000000000/63360 = 15782.82 recurring (that is, 15782.828282...) miles.
i farted!
1000000000
1000000000
10,000,000 of them.