Hex #156779 or rgb(21,103,121) in RGB space is the tint of bluish cian. It has hue angle of 190.80 degrees, value = 47 and saturation = 83. #156779 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 3 drops of cyan, 4 drops of black.
Nearest safe hex - #006666. Below you can see the block with #156779 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #156779 to the mixer and play with it.