I write 620 billion as 620 billion.
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
0.0171
2 m
249 in Roman numerals is CCXLIX
0.249 in fraction form is 249/1000. This fraction is already the simplest form.
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
Two hundred forty-nine.
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