The hex color #a66db5 is a light color. The web-safe version is Hex
#9966CC. A complementary color is
#59924A. The grayscale version is
#989898. A 20% lighter version of the original color is
#D9A0E8, and Hex
#733A82 is the 20% darker color. If the color is saturated by 10%, you get
#A769B8. If the color is desaturated by 10%, the color
#A571B2 is obtained.