6688111 has 2 divisors, whose sum is σ = 6688112. Its totient is φ = 6688110.

The previous prime is 6688109. The next prime is 6688117. The reversal of 6688111 is 1118866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6688111 - 2¹ = 6688109 is a prime.

Together with 6688109, it forms a pair of twin primes.

It is a Chen prime.

6688111 is a lucky number.

It is equal to p₄₅₆₇₂₇ and since 6688111 and 456727 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6688117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344055 + 3344056.

It is an arithmetic number, because the mean of its divisors is an integer number (3344056).

Almost surely, 2^6688111 is an apocalyptic number.

6688111 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688111 is an equidigital number, since it uses as much as digits as its factorization.

6688111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 6688111 is about 2586.1382406979. The cubic root of 6688111 is about 188.4087886927.

The spelling of 6688111 in words is "six million, six hundred eighty-eight thousand, one hundred eleven".