6566989 has 16 divisors (see below), whose sum is σ = 8124480. Its totient is φ = 5218560.

The previous prime is 6566977. The next prime is 6566993. The reversal of 6566989 is 9896656.

It is a cyclic number.

It is not a de Polignac number, because 6566989 - 2⁵ = 6566957 is a prime.

It is a super-2 number, since 2×6566989² = 86250689052242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509 + ... + 3925.

It is an arithmetic number, because the mean of its divisors is an integer number (507780).

Almost surely, 2^6566989 is an apocalyptic number.

It is an amenable number.

6566989 is a deficient number, since it is larger than the sum of its proper divisors (1557491).

6566989 is a wasteful number, since it uses less digits than its factorization.

6566989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its digits is 699840, while the sum is 49.

The square root of 6566989 is about 2562.6137047944. The cubic root of 6566989 is about 187.2644889006.

The spelling of 6566989 in words is "six million, five hundred sixty-six thousand, nine hundred eighty-nine".