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No. If going by the size of the event horizon, a diameter of 450,000 km would correspond to a black hole 76,200 times the mass of the sun, which would be considered an intermediate mass black hole, between stellar mass and supermassive.

The supermassive black hole at the center of our galaxy, at about 4 million times the mass of the sun has an event horizon about 23.6 million (23,600,000) kilometers across.

Black holes up to 12 billion solar masses have been detected with event horizons up to 71 billion (71,000,000,000) kilometers across. More massive ones may exist.

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Q: Is the biggest black hole 450000KM across?
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