666611041 has 2 divisors, whose sum is σ = 666611042. Its totient is φ = 666611040.

The previous prime is 666611027. The next prime is 666611059. The reversal of 666611041 is 140116666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551263441 + 115347600 = 23479^2 + 10740^2 .

It is a cyclic number.

It is not a de Polignac number, because 666611041 - 2¹⁹ = 666086753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666610994 and 666611012.

It is not a weakly prime, because it can be changed into another prime (666611641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333305520 + 333305521.

It is an arithmetic number, because the mean of its divisors is an integer number (333305521).

Almost surely, 2^666611041 is an apocalyptic number.

It is an amenable number.

666611041 is a deficient number, since it is larger than the sum of its proper divisors (1).

666611041 is an equidigital number, since it uses as much as digits as its factorization.

666611041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 666611041 is about 25818.8117658424. The cubic root of 666611041 is about 873.5561673126.

The spelling of 666611041 in words is "six hundred sixty-six million, six hundred eleven thousand, forty-one".