5665811 has 4 divisors (see below), whose sum is σ = 5999112. Its totient is φ = 5332512.

The previous prime is 5665789. The next prime is 5665837. The reversal of 5665811 is 1185665.

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 5665811 - 2⁶ = 5665747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166625 + ... + 166658.

It is an arithmetic number, because the mean of its divisors is an integer number (1499778).

Almost surely, 2^5665811 is an apocalyptic number.

5665811 is a deficient number, since it is larger than the sum of its proper divisors (333301).

5665811 is a wasteful number, since it uses less digits than its factorization.

5665811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333300.

The product of its digits is 7200, while the sum is 32.

The square root of 5665811 is about 2380.2964101137. The cubic root of 5665811 is about 178.2737340266.

The spelling of 5665811 in words is "five million, six hundred sixty-five thousand, eight hundred eleven".