6565661 has 2 divisors, whose sum is σ = 6565662. Its totient is φ = 6565660.

The previous prime is 6565633. The next prime is 6565681. The reversal of 6565661 is 1665656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 37636 = 2555^2 + 194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6565661 is a 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 (6565681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282830 + 3282831.

It is an arithmetic number, because the mean of its divisors is an integer number (3282831).

Almost surely, 2^6565661 is an apocalyptic number.

It is an amenable number.

6565661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6565661 is an equidigital number, since it uses as much as digits as its factorization.

6565661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 6565661 is about 2562.3545812397. The cubic root of 6565661 is about 187.2518649514.

The spelling of 6565661 in words is "six million, five hundred sixty-five thousand, six hundred sixty-one".