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The Gutenberg-Richter relation gives log10(E) = 1.5M + 4.8 in joules, so each magnitude unit is about 31.6 times the energy and each 0.2 units roughly doubles it. A magnitude 6.5 releases 1.4e14 J, about 33 kilotonnes of TNT, and 31.6 times more energy than a 5.5 - though ground motion amplitude is only ten times larger.
Gutenberg-Richter energy
log10(E) = 1.5 M + 4.8, E in joules
Energy ratio
ratio = 10^(1.5 x magnitude difference)
Because magnitude is a log10 amplitude scale, while energy scales as the 1.5 power of that - and 10^1.5 is 31.6.
No. Radiated seismic energy is a small fraction of the total moment release; much goes into fracturing and heating the fault.