Hex #66bbd5 or rgb(102,187,213) in RGB space is the tint of bluish cian. It has hue angle of 194.05 degrees, value = 84 and saturation = 52. #66bbd5 can be obtained by mixing 4 colors: 2 drops of blue, 3 drops of cyan, 4 drops of white, 1 drop of black.
Nearest safe hex - #66cccc. Below you can see the block with #66bbd5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66bbd5 to the mixer and play with it.