ACCOUNTID being "Truncated"

ACCOUNTID being "Truncated"

I am using ZOHO Reports in conjunction with ZOHO CRM. When I export the Events table to either and Excel or CSV file,
the ACCOUNTID number gets truncated, or rather the last three digits get replaced by 0s in the Excel or CSV. I have attached an example with screen shots. 

In ZOHO, ACCOUNTID is an 18-digit field (e.g., 917037000000222130). When you exporting it either to Excel or CSV, you see 9.17037E+17 in the Excel/CSV column; when you look at the actual number in the field it is 917037000000222000. Please see the example in the attached document. 

I tried looking at settings within ZOHO, but nothing seems to affect this. Any suggestions?

John Galich