RSA Challenge $n$

The easiest challenge at

  http://www.rsasecurity.com/rsalabs/challenges/factoring/numbers.html

is the 576-bit number

Name:         RSA-576
Prize:        $10000
Digits:       174
Digit Sum:    785
188198812920607963838697239461650439807163563379417382700763356422988859
715234665485319060606504743045317388011303396716199692321205734031879550
656996221305168759307650257059