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.
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.
a quarter of a billion
1.37 billion = 1,370,000,000 in figures.
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 700,000,000,000.
Expressed in figures, this is equal to 6,675,000,000.
a quarter of a billion
1.37 billion = 1,370,000,000 in figures.
1,300,000,000
7,042,000,000
13,800,000,000
15,000,000,000
1,000,000,000
1,600,000,000