6565681 has 2 divisors, whose sum is σ = 6565682. Its totient is φ = 6565680.

The previous prime is 6565661. The next prime is 6565709. The reversal of 6565681 is 1865656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4661281 + 1904400 = 2159^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 6565681 - 2¹¹ = 6563633 is a prime.

It is a super-2 number, since 2×6565681² = 86216333987522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6565681.

It is not a weakly prime, because it can be changed into another prime (6565661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282840 + 3282841.

It is an arithmetic number, because the mean of its divisors is an integer number (3282841).

Almost surely, 2^6565681 is an apocalyptic number.

It is an amenable number.

6565681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6565681 is an equidigital number, since it uses as much as digits as its factorization.

6565681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 6565681 is about 2562.3584838972. The cubic root of 6565681 is about 187.2520550837.

The spelling of 6565681 in words is "six million, five hundred sixty-five thousand, six hundred eighty-one".