6566791 has 12 divisors (see below), whose sum is σ = 8250256. Its totient is φ = 5116320.

The previous prime is 6566783. The next prime is 6566809. The reversal of 6566791 is 1976656.

It is not a de Polignac number, because 6566791 - 2³ = 6566783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3030 + ... + 4723.

Almost surely, 2^6566791 is an apocalyptic number.

6566791 is a deficient number, since it is larger than the sum of its proper divisors (1683465).

6566791 is a wasteful number, since it uses less digits than its factorization.

6566791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7782 (or 7771 counting only the distinct ones).

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

The square root of 6566791 is about 2562.5750720711. The cubic root of 6566791 is about 187.2626068233.

It can be divided in two parts, 656 and 6791, that added together give a palindrome (7447).

The spelling of 6566791 in words is "six million, five hundred sixty-six thousand, seven hundred ninety-one".