how much energy was needed to form the planet earth based on E=mc^2?

mass of earth = 5.9736 x 10^24
c = speed of light in vacuum = 2.99792458 x 10^8 m/s
E = 5.3688 x 10^41 J

based on mass of earth at 5.9736 × 10^24 kg
and speed of light at 3.00 x 10^ 8 m s^-1
gives 1.7921 x 10^ 33 kg m s^-1
0r
1792100000000000000000000000000000 Joules

this is the wrong way to ask such a question. you should ask what is the amount of energy obtained by converting whole of the mass of earth to energy. anyways the mass of earth is 5,973,600,000,000, 000,000,000,000 kg. taking the exact value of c, 299,792,458 m/s, c squared is 89,875,517,873,681,764.
multiplying the two, we get
520,702,800,352,962,667,9 10,400,000,000,000,000,000,000 Joules, or 520,702,800,352,962,667,9 10,400,000,000,000,000,000 kilo Joules, or 144,639,666,764,711,852, 197,333,333,333,333,333 kilo Watt Hours, while 14,767,748,493,203 kilo Watt hours was the estimated annual world electricity consumption in 2003, that means the energy could power up the world for about 97943 billion billion years