Armory number of possible wallets

[AbsoluteZero]

My wallet ID is 9 digits long. Numbers and letters

Does this mean that there are only 62^9 possible wallets?

(That would be about 10^16)

That is within the power of computers to crack.

Or is it possible for different wallets to have a "collision" and just have the same wallet ID?

[goatpig]

The ID is extracted from the first few bytes of the first public address in your wallet. That value is then encoded in base58, so it may not necessarily be 9 characters long.

ID collisions is a possibility but rather abysmal. The chance of actual wallet collision is the same as 256 bits integer collision, i.e. not gonna happen.