A billion is 1,000,000,000, that is 1 followed by 9 zeros. So 13.5 billion is
13.5 x 1000000000 = 13500000000
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As a number: 7,125,000,000 = 7.125 billion
As a number it is: 24,600,000,000 = 24.6 billion
19.35 billion = 19,350,000,000
As a number it is: 1,800,000,000 = 1.8 billion
As number it is: 1,500,000,000