666788888999 has 2 divisors, whose sum is σ = 666788889000. Its totient is φ = 666788888998.

The previous prime is 666788888971. The next prime is 666788889017. The reversal of 666788888999 is 999888887666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666788888999 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666788888299) 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, 333394444499 + 333394444500.

It is an arithmetic number, because the mean of its divisors is an integer number (333394444500).

Almost surely, 2^666788888999 is an apocalyptic number.

666788888999 is a deficient number, since it is larger than the sum of its proper divisors (1).

666788888999 is an equidigital number, since it uses as much as digits as its factorization.

666788888999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36118462464, while the sum is 92.

The spelling of 666788888999 in words is "six hundred sixty-six billion, seven hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred ninety-nine".