As a number it is: 2,000,000,000
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Half of 2 billion is 1 billion. To find half of a number, you divide it by 2. In this case, dividing 2 billion by 2 gives you 1 billion. This is because half of any number is equal to dividing that number by 2.
The number 2 billion can be written as the Roman numeral [MM] with a horizontal bar above it (which I can't write with my keyboard).
a billion and 1
A billion and one.
a billion and one