Not sure what you mean, but U.S. Highway 66 has always had that designation, literally from the day it opened.
U.S. Highway 666 was re-numbered as Highway 491 in 2003.
because thats he road that lost its other 6
I believe you are referring to Route 66.
Route 66 - 1960 Ten Drops of Water 1-6 was released on: USA: 11 November 1960
Route 66 - 1960 Once to Every Man 2-6 was released on: USA: 27 October 1961
An Idiot Abroad - 2010 Route 66 2-6 was released on: UK: 28 October 2011 USA: 25 February 2012
Route 66 - 1960 Sheba - 1.12 was released on: USA: 6 January 1961 Finland: 14 April 1962
Route 66 - 1960 Sheba 1-12 was released on: USA: 6 January 1961 Finland: 14 April 1962
Route 66 - 1960 Goodnight Sweet Blues 2-3 was released on: USA: 6 October 1961
Route 66 - 1960 And Make Thunder His Tribute 4-6 was released on: USA: 1 November 1963
No - 6/66 = 0.09 recurring (that is, 0.09090909...) However, 66 is divisible by 6, as 66/6 = 11.
.66 is greater than .6
11