Grand prismatotrishecatonicosachoron

The grand prismatotrishecatonicosachoron, or gapthi, is a nonconvex uniform polychoron that consists of 720 pentagonal prisms, 120 quasitruncated great stellated dodecahedra, 120 small dodecicosidodecahedra, and 120 quasitruncated dodecadodecahedra. 1 pentagonal prism, 1 quasitruncated great stellated dodecahedron, 1 small dodecicosidodecahedron, and 2 quasitruncated dodecadodecahedra join at each vertex.

It is in the same regiment as the quasiprismatorhombated grand hecatonicosachoron.