Hex #66b4c4 or rgb(102,180,196) in RGB space is the tint of bluish cian. It has hue angle of 190.21 degrees, value = 77 and saturation = 48. #66b4c4 can be obtained by mixing 4 colors: 1 drop of blue, 3 drops of cyan, 4 drops of white, 2 drops of black.
Nearest safe hex - #66cccc. Below you can see the block with #66b4c4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b4c4 to the mixer and play with it.