Given: The expression-
![64,646,480,523*789](https://img.qammunity.org/2023/formulas/mathematics/college/h4t9f1emwi589hohlyv4pisdlqbhub0mhi.png)
Required: To simplify the expression.
Explanation: The multiplication of two numbers can be performed by making two rows and then multiplying each numbered row-wise. The final rows are then added together for the answer.
Hence, multiplying the numbers as-
![51,006,073,132,647](https://img.qammunity.org/2023/formulas/mathematics/college/kca9qigd1gtyypvy23lzp1mr0ha5kwkfqw.png)
Final Answer: The final Answer is 51,006,073,132,647.