7 \times 10^{6}$ times the mass of the sun. We know that the mass of the sun is approximately $1.98 \times 10^{30}$ kg. Therefore, the mass of the black hole is $3.7 \times 10^{6} \times 1.98 \times 10^{30}$ kg. Simplifying this, we get $7.326 \times 10^{36}$ kg.
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