Hex #66a1d5 or rgb(102,161,213) in RGB space is the tint of blue. It has hue angle of 208.11 degrees, value = 84 and saturation = 52. #66a1d5 can be obtained by mixing 3 colors: 5 drops of blue, 1 drop of cyan, 4 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #66a1d5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a1d5 to the mixer and play with it.