44,000,000,000
86,044,000,072
83,063,044,128
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.
The number 4.44 x 10^10 in standard form is 44,000,000,000 or 44 billion.
40,300,000,000
$14.7 Billion USD in 2013
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