There are two "types" of Billion. Long and short.
A billion in the UK, used to be a million million. However, the Americans, for some unknown reason, decided to call a billion a 1,000 million. Probably so they could be billionaires a lot quicker.
So:
The long is now hardly used and the short is now the accepted usage.
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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