Hex #006677 or rgb(0,102,119) in RGB space is the tint of bluish cian. It has hue angle of 188.57 degrees, value = 47 and saturation = 100. #006677 can be obtained by mixing 3 colors: 1 drop of blue, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #006677 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #006677 to the mixer and play with it.