Depending on the country, a "billion" is either 1,000,000,000, or 1,000,000,000,000. The smaller version is become more common, though.
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Expressed in figures, 1.63 billion is equal to 1,630,000,000.
Expressed in figures, this is equal to 5500000000.
Expressed in figures, this is equal to 6,675,000,000.
1,600,000,000
6,390,000,000