This number is a composite.
The numbers 6!+5!+8!+(6+5+8) and 6!+5!+8!-(6+5+8) are each prime. Note that 658^(6+5+8)+(6+5+8) is prime too! [Sariyar]
The numbers 6!+5!+8!+(6+5+8) and 6!+5!+8!-(6+5+8) are each prime. Note that 658^(6+5+8)+(6+5+8) is prime too! [Sariyar]