Step 1: Write both numbers in scientific notation. For more information, use the SN Converter.
$$ 6666607854210 = 6.66660785421\cdot 10^{12} $$$$ 1 = 1 $$Step 2: Multiply the numeric parts. Note that in intermediate calculations, we need 6 significant digits.
$$ 6.66661 \cdot 1 \approx 6.66661 $$Step 3: Multiply $10^{ 12 }$ by $10^{ 0 }$:
$$ 10^{ 12 } \cdot 10^{ 0 } = 10^{ 12+0 } = 10^{ 12 } $$Step 4: Write the solution as the product of the numbers obtained in steps two and three.
$$ 6.66661 \cdot 10^{ 12 } $$