What do you exactly mean by that?
1. You go to https://web2.0calc.com/ and type in the number fully. After that, hit ENTER, which will show you the answer in scientific notation.
2. Write the power of ten as a factor behind it. The exponent of that power is equal to the number of digits by which you have shifted the decimal point to the left - positive exponent - or the right - negative exponent.