Either 9 or 12, depending on the region. In English-speaking countries, usually 9.
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9 zeros
1 billion has 9 zeros.
1 billion equals 1 billion, not a smaller number nor a larger number. it has 9 zeros. 1000000000
Ten billion is written as 1 followed by 10 zeros; 10,000,000,000
In the U.S., a billion is a thousand million, so Nine zeros.