1,800,000,000.
1 billion has nine zeros, so to write 1.8 billion in numbers you would simply need to move the decimal point nine places to the right, which would give you 1,800,000,000.
1.52 billion written in numbers is 1,520,000,000
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
$18,000,000,000.00 or $18 billion
15.8 billion = 15,800,000,000
Six billion = 6,000,000,000
153.4 billion = 153,400,000,000
3,900,000,000 is 3.9 billion.
1476 billion is 1,476,000,000,000
53.50 billion = 53,500,000,000
9.88 billion = 9,880,000,000
1.0773 billion = 1,077,300,000