If by billion you mean an American billion (109), 1,900,000,000. If you mean a British billion (1012), put 3 more 0s on to the end.
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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
2,280,000,000 = 2.28 billion
It is 27,638,000,000 = 27.638 billion