6565543601 has 2 divisors, whose sum is σ = 6565543602. Its totient is φ = 6565543600.

The previous prime is 6565543597. The next prime is 6565543603. The reversal of 6565543601 is 1063455656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6380175376 + 185368225 = 79876^2 + 13615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6565543601 - 2² = 6565543597 is a prime.

Together with 6565543603, 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 (6565543603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282771800 + 3282771801.

It is an arithmetic number, because the mean of its divisors is an integer number (3282771801).

Almost surely, 2^6565543601 is an apocalyptic number.

It is an amenable number.

6565543601 is a deficient number, since it is larger than the sum of its proper divisors (1).

6565543601 is an equidigital number, since it uses as much as digits as its factorization.

6565543601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 6565543601 is about 81028.0420656948. The cubic root of 6565543601 is about 1872.5074887624.

The spelling of 6565543601 in words is "six billion, five hundred sixty-five million, five hundred forty-three thousand, six hundred one".