As a number it is: 12,800,000,000 = twelve point eight billion
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17.9 billion written out in numbers is 17,900,000,000
1,000 billion billion is: 1,000,000,000,000,000,000,000
153.4 billion = 153,400,000,000
4.2 billion = 4,200,000,000
It is: 900,000,000 = 0.9 billion