Well, I don't know if the Toyota Prius is 64 bit, same with the others...
but more seriously, if you mean those laptop/tablet hybrids, many of the ultrabooks are 64-bit.
Surface Pro (1, 2, 3)
Lenovo Yoga (Yoga Pro, ThinkPad Yoga...)
Dell Venue 11 Pro (the Core models, not the base Atom)
... (to start)