6.9 billion as a number would be 6,900,000,000. To write it out without digits it would be six billion and nine hundred million.
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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
53.50 billion = 53,500,000,000
9.88 billion = 9,880,000,000