666587000785609 has 2 divisors, whose sum is σ = 666587000785610. Its totient is φ = 666587000785608.

The previous prime is 666587000785577. The next prime is 666587000785691. The reversal of 666587000785609 is 906587000785666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658606404035584 + 7980596750025 = 25663328^2 + 2824995^2 .

It is a cyclic number.

It is not a de Polignac number, because 666587000785609 - 2⁵ = 666587000785577 is a prime.

It is not a weakly prime, because it can be changed into another prime (666587000782609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333293500392804 + 333293500392805.

It is an arithmetic number, because the mean of its divisors is an integer number (333293500392805).

Almost surely, 2^{666587000785609} is an apocalyptic number.

It is an amenable number.

666587000785609 is a deficient number, since it is larger than the sum of its proper divisors (1).

666587000785609 is an equidigital number, since it uses as much as digits as its factorization.

666587000785609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 914457600, while the sum is 73.

The spelling of 666587000785609 in words is "six hundred sixty-six trillion, five hundred eighty-seven billion, seven hundred eighty-five thousand, six hundred nine".