6668669 has 4 divisors (see below), whose sum is σ = 7621344. Its totient is φ = 5715996.

The previous prime is 6668659. The next prime is 6668687. The reversal of 6668669 is 9668666.

6668669 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6668669 is a prime.

It is a super-2 number, since 2×6668669² = 88942292463122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668659) 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 in 3 ways as a sum of consecutive naturals, for example, 476327 + ... + 476340.

It is an arithmetic number, because the mean of its divisors is an integer number (1905336).

Almost surely, 2^6668669 is an apocalyptic number.

It is an amenable number.

6668669 is a deficient number, since it is larger than the sum of its proper divisors (952675).

6668669 is an equidigital number, since it uses as much as digits as its factorization.

6668669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952674.

The product of its digits is 559872, while the sum is 47.

The square root of 6668669 is about 2582.3766185435. The cubic root of 6668669 is about 188.2260465681.

It can be divided in two parts, 6668 and 669, that added together give a palindrome (7337).

The spelling of 6668669 in words is "six million, six hundred sixty-eight thousand, six hundred sixty-nine".