Five billion nine million can be written out as 5009000000. This can also be broken down into a more readable form with commas separating each group of three digits: 5009000000.
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As in numbers: 5 billion = 5,000,000,000 and 5 million = 5,000,000
5,009,000,000
As follows: 10,005,000,000.
5,086,099,505
The standard form is 5,006,000,012