666705503 has 2 divisors, whose sum is σ = 666705504. Its totient is φ = 666705502.

The previous prime is 666705467. The next prime is 666705511. The reversal of 666705503 is 305507666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666705503 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666705593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333352751 + 333352752.

It is an arithmetic number, because the mean of its divisors is an integer number (333352752).

Almost surely, 2^666705503 is an apocalyptic number.

666705503 is a deficient number, since it is larger than the sum of its proper divisors (1).

666705503 is an equidigital number, since it uses as much as digits as its factorization.

666705503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 666705503 is about 25820.6410261248. The cubic root of 666705503 is about 873.5974277380.

The spelling of 666705503 in words is "six hundred sixty-six million, seven hundred five thousand, five hundred three".