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One billion is written as 1,000,000,000 - 10 total digits.
In the US, one billion is written as the numeral one followed by 9 zeros (1,000,000,000). So, in the US, a billion has ten (10) digits. A billion has a very different meaning in the UK.
One thousand billion in digits looks like this: 1,000,000,000,000
10 digits
13 digits.