6687666 has 24 divisors (see below), whose sum is σ = 14676480. Its totient is φ = 2200536.

The previous prime is 6687631. The next prime is 6687689. The reversal of 6687666 is 6667866.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930 + ... + 3773.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^6687666 is an apocalyptic number.

6687666 is an abundant number, since it is smaller than the sum of its proper divisors (7988814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687666 is a wasteful number, since it uses less digits than its factorization.

6687666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790 (or 4787 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 6687666 is about 2586.0522036494. The cubic root of 6687666 is about 188.4046099458.

The spelling of 6687666 in words is "six million, six hundred eighty-seven thousand, six hundred sixty-six".