6678667 has 2 divisors, whose sum is σ = 6678668. Its totient is φ = 6678666.

The previous prime is 6678647. The next prime is 6678691. The reversal of 6678667 is 7668766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6678667 is a prime.

6678667 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6678647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339333 + 3339334.

It is an arithmetic number, because the mean of its divisors is an integer number (3339334).

Almost surely, 2^6678667 is an apocalyptic number.

6678667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6678667 is an equidigital number, since it uses as much as digits as its factorization.

6678667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 6678667 is about 2584.3117072056. The cubic root of 6678667 is about 188.3200655458.

Subtracting 6678667 from its reverse (7668766), we obtain a palindrome (990099).

The spelling of 6678667 in words is "six million, six hundred seventy-eight thousand, six hundred sixty-seven".