5666819 has 2 divisors, whose sum is σ = 5666820. Its totient is φ = 5666818.

The previous prime is 5666789. The next prime is 5666821. The reversal of 5666819 is 9186665.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5666819 is a prime.

It is a super-2 number, since 2×5666819² = 64225675157522, which contains 22 as substring.

Together with 5666821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5666849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2833409 + 2833410.

It is an arithmetic number, because the mean of its divisors is an integer number (2833410).

Almost surely, 2^5666819 is an apocalyptic number.

5666819 is a deficient number, since it is larger than the sum of its proper divisors (1).

5666819 is an equidigital number, since it uses as much as digits as its factorization.

5666819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 5666819 is about 2380.5081390325. The cubic root of 5666819 is about 178.2843055799.

The spelling of 5666819 in words is "five million, six hundred sixty-six thousand, eight hundred nineteen".