666666888999959 has 2 divisors, whose sum is σ = 666666888999960. Its totient is φ = 666666888999958.

The previous prime is 666666888999953. The next prime is 666666888999961. The reversal of 666666888999959 is 959999888666666.

666666888999959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666666888999959 - 2³² = 666662594032663 is a prime.

It is a Sophie Germain prime.

Together with 666666888999961, it forms a pair of twin primes.

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 666666888999959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666888999953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333444499979 + 333333444499980.

It is an arithmetic number, because the mean of its divisors is an integer number (333333444499980).

Almost surely, 2^{666666888999959} is an apocalyptic number.

666666888999959 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666888999959 is an equidigital number, since it uses as much as digits as its factorization.

666666888999959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7052774768640, while the sum is 110.

The spelling of 666666888999959 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, eight hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred fifty-nine".