The composite cofactor of 1723,83- was the product of 87-digit and 180-digit prime numbers:

87-digit prime factor:
126746883681830510924139910924073588559758879702364719509796340513434072323626312034813

180-digit prime factor:
187373250512038048341176960125984152240193694115156122590348855376180800562486815115381299533000810407100857702956608293135854100067508075632054966559233196050467633636900899137881

The factors have been reported to the OddPerfect project.