666411787 has 2 divisors, whose sum is σ = 666411788. Its totient is φ = 666411786.

The previous prime is 666411761. The next prime is 666411839. The reversal of 666411787 is 787114666.

666411787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666411787 - 2⁷ = 666411659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666411727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333205893 + 333205894.

It is an arithmetic number, because the mean of its divisors is an integer number (333205894).

Almost surely, 2^666411787 is an apocalyptic number.

666411787 is a deficient number, since it is larger than the sum of its proper divisors (1).

666411787 is an equidigital number, since it uses as much as digits as its factorization.

666411787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 666411787 is about 25814.9527793486. The cubic root of 666411787 is about 873.4691215967.

The spelling of 666411787 in words is "six hundred sixty-six million, four hundred eleven thousand, seven hundred eighty-seven".