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.
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One billion.
One quintillion.
1.billion
To write one billion three million, you would write out the number 1,003,000,000.
As a number it is: 1,800,000,000 = 1.8 billion