Well actually I only visited a small number of these churches, as in fact there are more then 86 churches in Quito.
So I think you need a few days to do that.
But some of these churches are so beautifully decorated, like La Compania de Jesus and La Merced.
At first I could not remember the name of the church on the picture, as we passed so many churches that day, that it was impossible to memorise all these names. And also this is only the clocktower, so you can't see any neighboring buildings. Like this it was difficult to recognise.
But now, few days later, after I have received the whole set of pictures (almost 1500 . . .), I know it, it is the clocktower of the Cathedral on Plaza de Independencia.

