5666811 has 8 divisors (see below), whose sum is σ = 7601664. Its totient is φ = 3754920.

The previous prime is 5666789. The next prime is 5666819. The reversal of 5666811 is 1186665.

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

It is not a de Polignac number, because 5666811 - 2¹⁰ = 5665787 is a prime.

It is a super-2 number, since 2×5666811² = 64225493819442, which contains 22 as substring.

5666811 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5666819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5155 + ... + 6156.

It is an arithmetic number, because the mean of its divisors is an integer number (950208).

Almost surely, 2^5666811 is an apocalyptic number.

5666811 is a deficient number, since it is larger than the sum of its proper divisors (1934853).

5666811 is a wasteful number, since it uses less digits than its factorization.

5666811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11481.

The product of its digits is 8640, while the sum is 33.

The square root of 5666811 is about 2380.5064587184. The cubic root of 5666811 is about 178.2842216836.

The spelling of 5666811 in words is "five million, six hundred sixty-six thousand, eight hundred eleven".