6645911 has 2 divisors, whose sum is σ = 6645912. Its totient is φ = 6645910.

The previous prime is 6645907. The next prime is 6645917. The reversal of 6645911 is 1195466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6645911 - 2² = 6645907 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322955 + 3322956.

It is an arithmetic number, because the mean of its divisors is an integer number (3322956).

Almost surely, 2^6645911 is an apocalyptic number.

6645911 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645911 is an equidigital number, since it uses as much as digits as its factorization.

6645911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 6645911 is about 2577.9664466397. The cubic root of 6645911 is about 188.0116844254.

The spelling of 6645911 in words is "six million, six hundred forty-five thousand, nine hundred eleven".