RSA-1536
RSA-1536 has 1,536 bits (463 decimal digits), and has not been factored so far. $150,000 was previously offered for successful factorization.
RSA-1536 = 18476997032117414743068356202001644030185493386634101714717857749106516967 11161249859337684305435744585616061544571794052229717732524660960646946071 24962372044202226975675668737842756238950876467844093328515749657884341508 84755282981867264513398633649319080846719904318743812833635027954702826532 97802934916155811881049844908319545009848393775227257052578591944993870073 69575568843693381277961308923039256969525326162082367649031603655137144791 3932347169566988069Read more about this topic: RSA Numbers