Hex #66b1c4 or rgb(102,177,196) in RGB space is the tint of bluish cian. It has hue angle of 192.13 degrees, value = 77 and saturation = 48. #66b1c4 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of blue, 5 drops of cyan, 2 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #66b1c4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b1c4 to the mixer and play with it.