In the United States and modern English, the number 1384 billion is written 1,384,000,000,000.
In Commonwealth usage, this is written 1,384,000,000,000,000.
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I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
40,300,000,000