4.6 billion is 4,600,000,000.... hundreds then thousands then millions then billions.
Therefore 4,600 million or " four thousand six hundred million"
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There are 5,050 millions in 5.05 billion.
There are 1,600 millions in 1.6 billion.
In general terms, 1 billion is equal to 1000 millions
A thousand millions = a billion in Australia.
23.5 billion equates to 23,500 millions.