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One billion is also written as 10^9,... One billion is equal to 1,000 million. One billion is written with a one followed by nine zeros, while one million is written with a one followed by six zeros. One billion is also written as 10^9, and one million is written as 10^6. Continue Reading
1 billion = 109. 1 billion billion = 1018. That's '1' followed by 18 zeros, for a grand total of 19 digits. But in the UK: 1 billion = 1012. 1 billion billion = 1024. That's '1' followed by 24 zeros, for a grand total of 25 digits.