'How to use group_by function with a integer64 variable?

I had a dataset in which My analysis unit is responses for certain quizzes. I has several variables for the submission of that quizzes. One of them is a ID for a course that the quiz belong to, that have like 14 or maybe 15 digits. I'm trying to apply the function group_by for make some descriptive statistics by that variable, and obtain this message error:

Error in UseMethod("group_by") : no applicable method for 'group_by' applied to an object of class "integer64"

I have read about integer variables 64 but I have not found an answer on how to transform them into characters.

group-bycharacterinteger64


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