A billion is a thousand million (at least in the US; the UK uses a slightly different system).
Since you have three thousand million, you have three billion.
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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"
One thousand thousands is one million: 1,000,000 In English speaking countries one thousand millions make a billion: 1,000,000,000 In non-English speaking countries one million millions make one billion: 1,000,000,000,000
There are 1,600 millions in 1.6 billion.
There are 5,050 millions in 5.05 billion.
In general terms, 1 billion is equal to 1000 millions