666506041 has 2 divisors, whose sum is σ = 666506042. Its totient is φ = 666506040.

The previous prime is 666506023. The next prime is 666506189. The reversal of 666506041 is 140605666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364962816 + 301543225 = 19104^2 + 17365^2 .

It is a cyclic number.

It is not a de Polignac number, because 666506041 - 2⁹ = 666505529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666505988 and 666506006.

It is not a weakly prime, because it can be changed into another prime (666506021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333253020 + 333253021.

It is an arithmetic number, because the mean of its divisors is an integer number (333253021).

Almost surely, 2^666506041 is an apocalyptic number.

It is an amenable number.

666506041 is a deficient number, since it is larger than the sum of its proper divisors (1).

666506041 is an equidigital number, since it uses as much as digits as its factorization.

666506041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 666506041 is about 25816.7782846737. The cubic root of 666506041 is about 873.5102993786.

The spelling of 666506041 in words is "six hundred sixty-six million, five hundred six thousand, forty-one".