6566981 has 8 divisors (see below), whose sum is σ = 7102080. Its totient is φ = 6048448.

The previous prime is 6566977. The next prime is 6566993. The reversal of 6566981 is 1896656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6566981 - 2² = 6566977 is a prime.

It is a super-2 number, since 2×6566981² = 86250478908722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3311 + ... + 4908.

It is an arithmetic number, because the mean of its divisors is an integer number (887760).

Almost surely, 2^6566981 is an apocalyptic number.

It is an amenable number.

6566981 is a deficient number, since it is larger than the sum of its proper divisors (535099).

6566981 is a wasteful number, since it uses less digits than its factorization.

6566981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8283.

The product of its digits is 77760, while the sum is 41.

The square root of 6566981 is about 2562.6121438876. The cubic root of 6566981 is about 187.2644128578.

The spelling of 6566981 in words is "six million, five hundred sixty-six thousand, nine hundred eighty-one".