\(B=24.\left(5^2+1\right)\left(5^4+1\right)......\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^2-1\right)\left(5^2+1\right)....\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^4-1\right).....\left(5^{32}+1\right)-5^{64}\)
\(B=\left(5^{32}-1\right)\left(5^{32}+1\right)-5^{64}\)
\(B=5^{64}-1-5^{64}\)
\(B=-1\)