The product is 1234567887654321. Notice that you have 8 11s * 9 11s.
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123456787654321
111,111,111 x 111,111,111 = 12,345,678,987,654,321
111111111 × 111111111 = 1.234567899×10¹⁶
12345678987654321
It is 12345678987654321.