6666667 has 4 divisors (see below), whose sum is σ = 7619056. Its totient is φ = 5714280.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666667 is 7666666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6666667 - 2¹⁵ = 6633899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476184 + ... + 476197.

It is an arithmetic number, because the mean of its divisors is an integer number (1904764).

Almost surely, 2^6666667 is an apocalyptic number.

6666667 is a deficient number, since it is larger than the sum of its proper divisors (952389).

6666667 is an equidigital number, since it uses as much as digits as its factorization.

6666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952388.

The product of its digits is 326592, while the sum is 43.

The square root of 6666667 is about 2581.9889620213. The cubic root of 6666667 is about 188.2072089130.

Subtracting 6666667 from its reverse (7666666), we obtain a palindrome (999999).

The spelling of 6666667 in words is "six million, six hundred sixty-six thousand, six hundred sixty-seven".