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³7 is a positive integer equal to $$7^{7^7}$$, read as to-the-third-seven, equal to $$7^{823543} \approx 3.759823526783788538922131 \times 10^{695974}$$. It has 695,975 digits. The superscript 3 represents tetration, meaning this is 7 Tetrated to 3.