$${ 2 }^{ 2 } \times { 4 }^{ 2 } \times { 9 }^{ 2 } \sqrt{ 5 } \times { 1 }^{ 2 } { 2 }^{ 2 } { 3 }^{ 2 } { 4 }^{ 2 } { 5 }^{ 2 } { 6 }^{ 2 } { 7 }^{ 2 } { 8 }^{ 2 } { 9 }^{ 2 }$$
$682638940569600\sqrt{5}\approx 1.526427075 \cdot 10^{15}$
$$2^{4}\times 4^{2}\times 9^{2}\sqrt{5}\times 1^{2}\times 3^{2}\times 4^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}\times 9^{2}$$
$$2^{4}\times 4^{4}\times 9^{2}\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}\times 9^{2}$$
$$2^{4}\times 4^{4}\times 9^{4}\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$16\times 4^{4}\times 9^{4}\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$16\times 256\times 9^{4}\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$4096\times 9^{4}\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$4096\times 6561\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$26873856\sqrt{5}\times 1^{2}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$26873856\sqrt{5}\times 1\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$26873856\sqrt{5}\times 3^{2}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$26873856\sqrt{5}\times 9\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$241864704\sqrt{5}\times 5^{2}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$241864704\sqrt{5}\times 25\times 6^{2}\times 7^{2}\times 8^{2}$$
$$6046617600\sqrt{5}\times 6^{2}\times 7^{2}\times 8^{2}$$
$$6046617600\sqrt{5}\times 36\times 7^{2}\times 8^{2}$$
$$217678233600\sqrt{5}\times 7^{2}\times 8^{2}$$
$$217678233600\sqrt{5}\times 49\times 8^{2}$$
$$10666233446400\sqrt{5}\times 8^{2}$$
$$10666233446400\sqrt{5}\times 64$$
$$682638940569600\sqrt{5}$$
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