6668887 has 2 divisors, whose sum is σ = 6668888. Its totient is φ = 6668886.

The previous prime is 6668881. The next prime is 6668899. The reversal of 6668887 is 7888666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6668887 - 2⁷ = 6668759 is a prime.

6668887 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6668887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334443 + 3334444.

It is an arithmetic number, because the mean of its divisors is an integer number (3334444).

Almost surely, 2^6668887 is an apocalyptic number.

6668887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668887 is an equidigital number, since it uses as much as digits as its factorization.

6668887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 49.

The square root of 6668887 is about 2582.4188273787. The cubic root of 6668887 is about 188.2280975937.

The spelling of 6668887 in words is "six million, six hundred sixty-eight thousand, eight hundred eighty-seven".