666392759 has 2 divisors, whose sum is σ = 666392760. Its totient is φ = 666392758.

The previous prime is 666392689. The next prime is 666392767. The reversal of 666392759 is 957293666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666392759 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666392759.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666392789) 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, 333196379 + 333196380.

It is an arithmetic number, because the mean of its divisors is an integer number (333196380).

Almost surely, 2^666392759 is an apocalyptic number.

666392759 is a deficient number, since it is larger than the sum of its proper divisors (1).

666392759 is an equidigital number, since it uses as much as digits as its factorization.

666392759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 53.

The square root of 666392759 is about 25814.5842306244. The cubic root of 666392759 is about 873.4608081540.

The spelling of 666392759 in words is "six hundred sixty-six million, three hundred ninety-two thousand, seven hundred fifty-nine".