1.524157875019052e+16
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The answer to 123456789 x 123456789 is 15241578750190521. This result is obtained by multiplying the two numbers using the standard multiplication algorithm. The product of these two 9-digit numbers is a 17-digit number.
Oh, what a lovely question! The answer to 123456789 multiplied by 123456789 is a very big number - 15,241,578,920,373,161. Just imagine all the happy little numbers dancing together to create something truly wonderful. Remember, there are no mistakes, just happy little accidents in math!