666841759 has 2 divisors, whose sum is σ = 666841760. Its totient is φ = 666841758.

The previous prime is 666841733. The next prime is 666841771. The reversal of 666841759 is 957148666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666841759 - 2⁹ = 666841247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666841789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333420879 + 333420880.

It is an arithmetic number, because the mean of its divisors is an integer number (333420880).

Almost surely, 2^666841759 is an apocalyptic number.

666841759 is a deficient number, since it is larger than the sum of its proper divisors (1).

666841759 is an equidigital number, since it uses as much as digits as its factorization.

666841759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 666841759 is about 25823.2794005719. The cubic root of 666841759 is about 873.6569366628.

The spelling of 666841759 in words is "six hundred sixty-six million, eight hundred forty-one thousand, seven hundred fifty-nine".