Get the maximum possible ID value for a primary key?

Is there a way to get the maximum value that an ID can be for a model that uses AutoField for its primary key? For example, in PostgreSQL I could do:

SELECT maximum_value FROM information_schema.sequences WHERE sequence_name = 'my_sequence_id_seq';

 maximum_value
---------------
 99999
(1 row)

I'm looking through the model meta data and the AutoField but I don't see anything.

Thanks

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