6667447666 has 16 divisors (see below), whose sum is σ = 10917643968. Its totient is φ = 3028637200.

The previous prime is 6667447649. The next prime is 6667447691.

6667447666 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6667447666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67045 + ... + 133528.

It is an arithmetic number, because the mean of its divisors is an integer number (682352748).

Almost surely, 2^6667447666 is an apocalyptic number.

6667447666 is a deficient number, since it is larger than the sum of its proper divisors (4250196302).

6667447666 is a wasteful number, since it uses less digits than its factorization.

6667447666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202097.

The product of its digits is 36578304, while the sum is 58.

The square root of 6667447666 is about 81654.4405773501. The cubic root of 6667447666 is about 1882.1455497434.

The spelling of 6667447666 in words is "six billion, six hundred sixty-seven million, four hundred forty-seven thousand, six hundred sixty-six".