Zoho Creator ID is 19 digits but max integer is Zoho CRM is 18?

Zoho Creator ID is 19 digits but max integer is Zoho CRM is 18?

Integrating Zoho CRM and Creator.  Want to store Creator ID in Zoho CRM record for future record updates.  It seems that the max length of the Long Integer field in CRM is 18 digits whereas the ID in Creator is 19 digits.  Am I missing something here?

Yes, of course I can store as text, but why make this any harder Zoho.