How close

Using only prime numbers less than 30, the closest (less than) we can get from ${10}^{10}-1$ is :
$9999928224=2^5\times 3^5\times 11\times 13\times 17\times {23}^2$

Using only prime numbers less than 50, how close can you get from ${10}^{15}-1$ ?

[My timing: 60 sec]