6656791 has 4 divisors (see below), whose sum is σ = 6719112. Its totient is φ = 6594472.

The previous prime is 6656779. The next prime is 6656807. The reversal of 6656791 is 1976566.

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 6656791 - 2⁵ = 6656759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656711) 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, 31000 + ... + 31213.

It is an arithmetic number, because the mean of its divisors is an integer number (1679778).

Almost surely, 2^6656791 is an apocalyptic number.

6656791 is a deficient number, since it is larger than the sum of its proper divisors (62321).

6656791 is a wasteful number, since it uses less digits than its factorization.

6656791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62320.

The product of its digits is 68040, while the sum is 40.

The square root of 6656791 is about 2580.0757740811. The cubic root of 6656791 is about 188.1142262679.

It can be divided in two parts, 6656 and 791, that added together give a palindrome (7447).

The spelling of 6656791 in words is "six million, six hundred fifty-six thousand, seven hundred ninety-one".