6566671 has 4 divisors (see below), whose sum is σ = 6572344. Its totient is φ = 6561000.

The previous prime is 6566663. The next prime is 6566701. The reversal of 6566671 is 1766656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(6566671) divides (6566671-1)³.

It is a cyclic number.

It is not a de Polignac number, because 6566671 - 2³ = 6566663 is a prime.

It is a super-3 number, since 3×6566671³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6566671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566621) 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 3 ways as a sum of consecutive naturals, for example, 405 + ... + 3646.

It is an arithmetic number, because the mean of its divisors is an integer number (1643086).

Almost surely, 2^6566671 is an apocalyptic number.

6566671 is the 1621-st heptagonal number.

6566671 is a deficient number, since it is larger than the sum of its proper divisors (5673).

6566671 is a wasteful number, since it uses less digits than its factorization.

6566671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672.

The product of its digits is 45360, while the sum is 37.

The square root of 6566671 is about 2562.5516580159. The cubic root of 6566671 is about 187.2614661521.

The spelling of 6566671 in words is "six million, five hundred sixty-six thousand, six hundred seventy-one".