No. CU*Talk includes a mechanism to intercept and automatically "downsize" the balance sizes to the maximum number of digits CU*Talk can handle and reformat the dates from the database before sending it on to CU*Talk to be relayed to the members. Amounts that too large will cause a generic message to be read to the member that the amount is currently not available.
Our plan is to address that if and when we start seeing member balances and activity grow to the point that CU*Talk needs to be able to accommodate them.