6667665 has 16 divisors (see below), whose sum is σ = 10870848. Its totient is φ = 3488576.

The previous prime is 6667657. The next prime is 6667669. The reversal of 6667665 is 5667666.

It is a cyclic number.

It is not a de Polignac number, because 6667665 - 2³ = 6667657 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6667669) 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 15 ways as a sum of consecutive naturals, for example, 3399 + ... + 4988.

It is an arithmetic number, because the mean of its divisors is an integer number (679428).

Almost surely, 2^6667665 is an apocalyptic number.

It is an amenable number.

6667665 is a deficient number, since it is larger than the sum of its proper divisors (4203183).

6667665 is a wasteful number, since it uses less digits than its factorization.

6667665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448.

The product of its digits is 272160, while the sum is 42.

The square root of 6667665 is about 2582.1822166532. The cubic root of 6667665 is about 188.2165999836.

Subtracting from 6667665 its reverse (5667666), we obtain a palindrome (999999).

The spelling of 6667665 in words is "six million, six hundred sixty-seven thousand, six hundred sixty-five".