1000000 = one million
1000000000 = one US billion
1000000000000 = one UK billion
So one million is 1000 US billion, and 1000000 UK billion, although common practice in the UK nowadays is to use the US definition.
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One thousand millions equals one billion.
In US usage, one billion is 1000 million or 1,000,000,000 In traditional British usage and usage in much of the rest of the world, it is one million million or 1,000,000,000,000.
1,000,000,000,000 or One thousand billion One million million One billion thousand
1000 million is 1 billion.
In Europe billion comes after milliard, while in America 'milliard' does not exist. So while in America one billion equals one hundred million, it is one thousand million in Europe.