4,900,000,000
49,000,000,000
49 billion punches
49 billion
I write 620 billion as 620 billion.
You write "49", then you either add 9 or 12 zeros, depending on whether you prefer the "short scale" or the "long scale". English-speaking countries would usually add 9 zeros (short scale).
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
40,300,000,000
As a number it is: 1,800,000,000 = 1.8 billion
Since you asked how I would write the number, the answer is 1031.
1,000 billion billion is: 1,000,000,000,000,000,000,000
35.9204067 billion