This number is a prime.
Smallest emirp such that 1+1+5^5+3^3+5^5+3^3+7^7+5^5+7^7 = 1656517 and 1+6^6+5^5+6^6+5^5+1+7^7 = 923107 are emirps. [Sariyar]
Smallest emirp such that 1+1+5^5+3^3+5^5+3^3+7^7+5^5+7^7 =
1656517 and 1+6^6+5^5+6^6+5^5+1+7^7 = 923107 are emirps. [Sariyar]