6666668995999 has 2 divisors, whose sum is σ = 6666668996000. Its totient is φ = 6666668995998.

The previous prime is 6666668995897. The next prime is 6666668996041. The reversal of 6666668995999 is 9995998666666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666668995999 - 2⁹ = 6666668995487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666668995099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333334497999 + 3333334498000.

It is an arithmetic number, because the mean of its divisors is an integer number (3333334498000).

Almost surely, 2^{6666668995999} is an apocalyptic number.

6666668995999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666668995999 is an equidigital number, since it uses as much as digits as its factorization.

6666668995999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110199605760, while the sum is 94.

It can be divided in two parts, 6666668 and 995999, that added together give a palindrome (7662667).

The spelling of 6666668995999 in words is "six trillion, six hundred sixty-six billion, six hundred sixty-eight million, nine hundred ninety-five thousand, nine hundred ninety-nine".