5666999 has 4 divisors (see below), whose sum is σ = 6102936. Its totient is φ = 5231064.

The previous prime is 5666987. The next prime is 5667029. The reversal of 5666999 is 9996665.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5666999 - 2¹² = 5662903 is a prime.

It is a super-2 number, since 2×5666999² = 64229755332002, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5666939) 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, 217949 + ... + 217974.

It is an arithmetic number, because the mean of its divisors is an integer number (1525734).

Almost surely, 2^5666999 is an apocalyptic number.

5666999 is a deficient number, since it is larger than the sum of its proper divisors (435937).

5666999 is a wasteful number, since it uses less digits than its factorization.

5666999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435936.

The product of its digits is 787320, while the sum is 50.

The square root of 5666999 is about 2380.5459457864. The cubic root of 5666999 is about 178.2861932253.

The spelling of 5666999 in words is "five million, six hundred sixty-six thousand, nine hundred ninety-nine".