I'm reading my bottle and it says on the front "A billion organisms guaranteed at the time of manufacture". Not sure if that's a billion for the whole bottle? On the ingredients one wafer contains 50mg of acidophilus and 50mg of bifidis. Sounds like you have a few more billion than me to say the least! Maybe that's why on mine they tell you to take up to 3 a day. Hmmmm.
Do you have a CVS where you live? That's where I bought these at and they sometimes go on sale buy one get one free there.