1,500,000,000
= 1.5 X 109
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15,000,027
The number 1 followed by 15 zeros is known as a quadrillion in the short scale system used in the United States and modern English-speaking countries. In the long scale system used in some European countries, this number is called a thousand billion. It is represented as 10^15 in scientific notation.
15/100000000 or 0.00000015 or 1.5 * 10^-7
one thousand million=15 billion 1 billion/ 15 billion = 1/15= 0.0666
15