641 OM amita-vikramaaya namaH .
One of unlimited prowess.
Or one whose prowess cannot be obstructed by anyone.
629 OM bhuushhaNaaya namaH .
One who adorned the earth by manifesting as various incarnations.
801 OM akshobhyaaya namaH .
One who is never perturbed by passions (like attachment and aversion), by objects of the senses (like sound, taste, etc.) or by asuras (the antagonists of the devas).