6666657 has 4 divisors (see below), whose sum is σ = 8888880. Its totient is φ = 4444436.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666657 is 7566666.

6666657 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 not a de Polignac number, because 6666657 - 2⁶ = 6666593 is a prime.

It is a D-number.

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, 1111107 + ... + 1111112.

It is an arithmetic number, because the mean of its divisors is an integer number (2222220).

Almost surely, 2^6666657 is an apocalyptic number.

It is an amenable number.

6666657 is a deficient number, since it is larger than the sum of its proper divisors (2222223).

6666657 is a wasteful number, since it uses less digits than its factorization.

6666657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222222.

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

The square root of 6666657 is about 2581.9870255290. The cubic root of 6666657 is about 188.2071148093.

Subtracting 6666657 from its reverse (7566666), we obtain a palindrome (900009).

The spelling of 6666657 in words is "six million, six hundred sixty-six thousand, six hundred fifty-seven".