/usr/lib/linux-tools/3.13.0-39-lowlatency/cpupower is in linux-tools-3.13.0-39-lowlatency 3.13.0-39.66.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/3.13.0-39-lowlatency/../../linux-tools-3.13.0-39/cpupower