Hex #668689 or rgb(102,134,137) in RGB space is the tint of cyan. It has hue angle of 185.14 degrees, value = 54 and saturation = 26. #668689 can be obtained by mixing 4 colors: 2 drops of yellow, 5 drops of blue, 2 drops of white, 1 drop of black.
Nearest safe hex - #669999. Below you can see the block with #668689 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668689 to the mixer and play with it.