That number is an average number of bits per elementary particle. I presume that information can be found not only in particles, but also in how they're arrang

That number is an average number of bits per elementary particle. I presume that information can be found not only in particles, but also in how they're arranged. On the other hand, information need not come in whole bits: there are three quark "colors." Storing the color of a quark takes, what, 1.5 bits on average?