66.6 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 666/10. You can simplify this rational fraction if required.
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666 is 11988 eighteenths.
It is 666/1000, not reduced.
66.6 = 666/10 = 333/5
0.666 = 666/1000 = 2/3 * Subject to rounding as .666 repeated would be 2/3, but often is rounded. *
2/3