109, the same as the American billion.
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500000000, using the british billion, 10^9 500000000000, using the American billion, 10^12
1000 billion is equal to a trillion
In the more widely-used American numbering system, a billion is equal to one thousand million (1,000,000,000) while a trillion is equal to one million million (1,000,000,000), a difference of 999,000,000,000. In the British and Commonwealth system, a billion is equal to one million million (1,000,000,000,000) while a trillion is equal to one million million million (1,000,000,000,000,000,000), a difference of 999,999,000,000,000,000.
A billion = 1,000,000,000.
By the uniqueness of numbers, it is equal to 18 billion: no more, no less.