How many works have beethoven done in his life time ?

i.jones is correct inasmuch as Beethoven's opus numbers go to 138. However, some of Beethoven's opuses contain several works (Op 18 comprises 6 string quartets, for instance) and there are very many works without opus numbers (which one will often see catalogued as 'WoO'). There are 205 of these alone! The actual number of individual works Beethoven wrote is 849 (according to Biamonti's catalogue).