2.64
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2.64
To read the number 2, followed by 66 zeros, you would say "Two duodecillion." In scientific notation, this number would be written as 2 x 10^66. Each group of three zeros is denoted by a specific name (thousand, million, billion, trillion, etc.), and the pattern repeats every three zeros.
66 billion trillion.
25% of 66= 25% * 66= 0.25 * 66= 16.5