What is the range of string type vid

When I insert Node data, Nebula prompts a bug as follow.
Storage Error:the VID must be a 64-bit interger or a string fitting space vertex id length limit.

I’m using VIDs of string type, which are on the order of tens of billions,such as 2,916,359,872
in the docs,i see string corresponds to FIXED_STRING,
so please What is the range of string type vid

You could run desc space <your_space> see the type of vid.It’s FIXED_STRING(N), the N is the length limit of vid.