3.98 billion = 3 980 000 000
3.98 x 1011
398,014,001,000.
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.
3.98 x 1011
398,014,001,000.
I write 620 billion as 620 billion.
three hundred ninety-eight.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
In today's notation of Roman numerals: CCCXCVIII
398/100 or 199/50
You can write 40.3 billion as 40,300,000,000.
You can write out 1.8 billion as "1,800,000,000" or "one billion eight hundred million."
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