"Vakratunda Mahakaya Suryakoti Samaprabha Neervigna Kurume Deve Sarva Karyeshu Sarvada"
This means:
O Lord Ganesha, you who possess a large body (mahakaya) a curved trunk (vakratunda), and have the brilliance of a million suns (surya koti), please keep all my activities free of obstacles - always.