6665611 has 2 divisors, whose sum is σ = 6665612. Its totient is φ = 6665610.

The previous prime is 6665597. The next prime is 6665623. The reversal of 6665611 is 1165666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6665611 - 2¹⁹ = 6141323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6665671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332805 + 3332806.

It is an arithmetic number, because the mean of its divisors is an integer number (3332806).

Almost surely, 2^6665611 is an apocalyptic number.

6665611 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665611 is an equidigital number, since it uses as much as digits as its factorization.

6665611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 6665611 is about 2581.7844604072. The cubic root of 6665611 is about 188.1972710481.

Subtracting from 6665611 its reverse (1165666), we obtain a palindrome (5499945).

The spelling of 6665611 in words is "six million, six hundred sixty-five thousand, six hundred eleven".