Hex #154d6b or rgb(21,77,107) in RGB space is the tint of bluish cian. It has hue angle of 200.93 degrees, value = 42 and saturation = 80. #154d6b can be obtained by mixing 4 colors: 1 drop of red, 3 drops of blue, 3 drops of cyan, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #154d6b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #154d6b to the mixer and play with it.