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The largest known perfect number is $$M_{49}(\frac{M_{49}+1}{2}) \approx 4.51 \cdot 10^{44,677,234}$$, where $$M_{49}$$ is the largest known Mersenne prime.[1]

### Sources Edit

1. Weisstein, Eric W. "Perfect Number." From MathWorld -- A Wolfram Web Resource