1,000,000,000 = 1 billion.
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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).
Ways to write one billion is: one billion,1 billion,1,000,000,000,you can write it in roman numeral several different ways,with tally marks, etc.
2000000000
18,400,000,000
2.3 billion is written: 2,300,000,000