What number is this, how do you say it

How do you say this number?
317,438,990,000,000,000,000

Three hundred and seventeen quintillion four hundred and thirty eight quadrillion nine hundred and ninety trillion.

However--at least in the States--the word "and" signals a decimal point. So I would drop all instances of that word from the winning description.

Otherwise, "One million, two hundred and thirty thousand and fourteen millionths" could mean either
1,230,000.000014 or
1,000,200.030014

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I wouldn't try and say it but use powers instead.

3.1743899 x10^20

Roughly =

3.17 x10^20

you may refer it as 3.17 x 10^20 .