Hex #66767d or rgb(102,118,125) in RGB space is the tint of bluish cian. It has hue angle of 198.26 degrees, value = 49 and saturation = 18. #66767d can be obtained by mixing 4 colors: 2 drops of yellow, 4 drops of red, 5 drops of blue, 4 drops of cyan.
Nearest safe hex - #666666. Below you can see the block with #66767d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66767d to the mixer and play with it.