sorry, amendment on angle, should be -129.5458 deg (50.4542 deg is indeed phase margin)
>> abs(-0.6367 - 0.7711i)
ans = 1.0000
>> angle(-0.6367 - 0.7711i)
ans = -2.2610 rad
>> -2.2610*180/pi
ans = -129.5458 deg
>> -129.5458+180
ans = 50.4542 deg (phase margin)
*Substitute ω = 164.294e3*2pi into (ω*0.001325i + 110.4)/(1.872e-33i*ω^5 + 3.052e-24*ω^4 - 7.143e-16i*ω^3 - 1.059e-09*ω^2) will get -0.6367 - 0.7711i