Hex #66b0c4 or rgb(102,176,196) in RGB space is the tint of bluish cian. It has hue angle of 192.77 degrees, value = 77 and saturation = 48. #66b0c4 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 2 drops of cyan, 3 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #66b0c4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66b0c4 to the mixer and play with it.