Write 12, followed by 9 zeroes. Or 12 zeroes, depending where you live - but 9 zeroes is more common.
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1.52 billion written in numbers is 1,520,000,000
Six billion = 6,000,000,000
15.8 billion = 15,800,000,000
3,900,000,000 is 3.9 billion.
1,270,000,000