Large value names (million etc.. but bigger)

12,381,557,655,576,425,121, that is 39 ^ 12, I know this:
655,576,425,121 = 655B, 576M, 425K, 121H (Billion, Million, Thousand, Hundred)

But what is the values 12,381 at the front called? and if there are any others, what are they called too please..

I'm just curious, if anyone can help me, I'd appreciate it.

Cheers
Icyculyr

No one can remember all of these!!!
See here: Names of large and small numbers

I'm getting "Access forbidden" on anhn's link, so I'll point to Wikipedia: Names of large numbers