The English word '1' has a couple of different senses or meanings: 1: used of a single unit or thing; not two or more; 2: the smallest whole number or a numeral representing this number
Use caution, the amount varies by location! In the United States, a billion is a thousand million or 1,000,000,000 units ie 10^9. In Europe, the amount is 10^12 or a million million,...