Hex #66abb3 or rgb(102,171,179) in RGB space is the tint of cyan. It has hue angle of 186.23 degrees, value = 70 and saturation = 43. #66abb3 can be obtained by mixing 4 colors: 1 drop of red, 4 drops of cyan, 3 drops of white, 2 drops of black.
Nearest safe hex - #6699cc. Below you can see the block with #66abb3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66abb3 to the mixer and play with it.