666708047 has 2 divisors, whose sum is σ = 666708048. Its totient is φ = 666708046.

The previous prime is 666708013. The next prime is 666708059. The reversal of 666708047 is 740807666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666708047 - 2¹² = 666703951 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 666707989 and 666708007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666708067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333354023 + 333354024.

It is an arithmetic number, because the mean of its divisors is an integer number (333354024).

Almost surely, 2^666708047 is an apocalyptic number.

666708047 is a deficient number, since it is larger than the sum of its proper divisors (1).

666708047 is an equidigital number, since it uses as much as digits as its factorization.

666708047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 666708047 is about 25820.6902889911. The cubic root of 666708047 is about 873.5985388878.

The spelling of 666708047 in words is "six hundred sixty-six million, seven hundred eight thousand, forty-seven".