6666668999999 has 64 divisors (see below), whose sum is σ = 7367915520000. Its totient is φ = 6012183526272.

The previous prime is 6666668999971. The next prime is 6666669000023. The reversal of 6666668999999 is 9999998666666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666668999999 is a prime.

6666668999999 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666668995999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3335001002 + ... + 3335003000.

It is an arithmetic number, because the mean of its divisors is an integer number (115123680000).

Almost surely, 2^{6666668999999} is an apocalyptic number.

6666668999999 is a deficient number, since it is larger than the sum of its proper divisors (701246520001).

6666668999999 is a wasteful number, since it uses less digits than its factorization.

6666668999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804.

The product of its digits is 198359290368, while the sum is 98.

It can be divided in two parts, 6666668 and 999999, that added together give a palindrome (7666667).

The spelling of 6666668999999 in words is "six trillion, six hundred sixty-six billion, six hundred sixty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".