The number 1 billion can be written as the Roman numeral [M] with a horizontal bar above it (which I can't write with my keyboard). Do that four times for four billion, then add VI which is six.
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In Roman numerals it is: 406 = CDVI
One is I in Roman numerals. This is two II, but four is IV, V is five, and six is VI.
Oh, what a happy little question! To write six billion in Roman numerals, you would use a combination of symbols. Six billion is written as VI followed by three sets of one thousand, which is represented by M. So, in Roman numerals, six billion would be VI MMM MMM. Just remember, there are no mistakes in art, only happy accidents!
The number six is written VI in Roman numerals.
The number six is represented as "VI" in Roman numerals.