6.5 BILLION solar masses
Just to give you an idea of scale the Solar System is about the size of the event horizon.
M87 is not just a monster, its a supermassive monster that makes Sgr A# look titchy.
Hats off to Katie Bouman, for her stack of hard drives and ingenuity in stitching together all that data.
Soon to be Nobel Laureate with any luck, and honorary "Time Lord".
Random: the gravitational field of supermassive BH's are actually gentler than those of smaller BH's so its possible
that you could actually get pretty close yet not get crushed. Of course you probably don't want to do that because
its a one way trip.