5666689 has 4 divisors (see below), whose sum is σ = 6476224. Its totient is φ = 4857156.

The previous prime is 5666681. The next prime is 5666701. The reversal of 5666689 is 9866665.

5666689 is digitally balanced in base 3 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5666689 - 2³ = 5666681 is a prime.

It is a super-2 number, since 2×5666689² = 64222728445442, which contains 22 as substring.

It is a Duffinian number.

5666689 is strictly pandigital in base 8.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (5666681) 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, 404757 + ... + 404770.

It is an arithmetic number, because the mean of its divisors is an integer number (1619056).

Almost surely, 2^5666689 is an apocalyptic number.

It is an amenable number.

5666689 is a deficient number, since it is larger than the sum of its proper divisors (809535).

5666689 is an equidigital number, since it uses as much as digits as its factorization.

5666689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809534.

The product of its digits is 466560, while the sum is 46.

The square root of 5666689 is about 2380.4808337813. The cubic root of 5666689 is about 178.2829422555.

The spelling of 5666689 in words is "five million, six hundred sixty-six thousand, six hundred eighty-nine".