As a number it is: 1,800,000,000 = 1.8 billion
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You can write out 1.8 billion as "1,800,000,000" or "one billion eight hundred million."
21,018,000,025
42.4 billion * 57 million = 2.4168*10^18.
I write 620 billion as 620 billion.
9,018,0046,072
Sixteen point two billion is how I would write it.