There are infinitely many answers. Two possibilities are
1*64 and 10*6.4
The expression (64 \times 64 \times 64 \times 64 \times 64 \times 64 \times 64 \times 64) can be simplified using exponents. It is equal to (64^8). Calculating that gives (64^8 = 2^{48}), which equals 281,474,976,710,656.
10
8 x 64 = 512
8 8*8=64
35 times 64 times 56 times 54 is equal to 6,773,760.
2.297397
16
64 = 1024
8x8 Equals To 64
8 x 8 = 64
16 x 4 = 64
8 multiplied by 8 is 64.