6668888888909 has 4 divisors (see below), whose sum is σ = 7181880341916. Its totient is φ = 6155897435904.

The previous prime is 6668888888897. The next prime is 6668888888941. The reversal of 6668888888909 is 9098888888666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 733224001225 + 5935664887684 = 856285^2 + 2436322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6668888888909 is a prime.

It is a super-2 number, since 2×6668888888909² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668888888989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256495726484 + ... + 256495726509.

It is an arithmetic number, because the mean of its divisors is an integer number (1795470085479).

Almost surely, 2^{6668888888909} is an apocalyptic number.

It is an amenable number.

6668888888909 is a deficient number, since it is larger than the sum of its proper divisors (512991453007).

6668888888909 is a wasteful number, since it uses less digits than its factorization.

6668888888909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512991453006.

The product of its (nonzero) digits is 36691771392, while the sum is 92.

The spelling of 6668888888909 in words is "six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, nine hundred nine".