666666610559 has 2 divisors, whose sum is σ = 666666610560. Its totient is φ = 666666610558.

The previous prime is 666666610487. The next prime is 666666610583. The reversal of 666666610559 is 955016666666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666666610559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666612559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333305279 + 333333305280.

It is an arithmetic number, because the mean of its divisors is an integer number (333333305280).

Almost surely, 2^666666610559 is an apocalyptic number.

666666610559 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666610559 is an equidigital number, since it uses as much as digits as its factorization.

666666610559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62985600, while the sum is 62.

The spelling of 666666610559 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred ten thousand, five hundred fifty-nine".