6565061561 has 2 divisors, whose sum is σ = 6565061562. Its totient is φ = 6565061560.

The previous prime is 6565061537. The next prime is 6565061627. The reversal of 6565061561 is 1651605656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5063034025 + 1502027536 = 71155^2 + 38756^2 .

It is a cyclic number.

It is not a de Polignac number, because 6565061561 - 2⁶ = 6565061497 is a prime.

It is not a weakly prime, because it can be changed into another prime (6565061501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282530780 + 3282530781.

It is an arithmetic number, because the mean of its divisors is an integer number (3282530781).

Almost surely, 2^6565061561 is an apocalyptic number.

It is an amenable number.

6565061561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6565061561 is an equidigital number, since it uses as much as digits as its factorization.

6565061561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 6565061561 is about 81025.0674853159. The cubic root of 6565061561 is about 1872.4616613511.

The spelling of 6565061561 in words is "six billion, five hundred sixty-five million, sixty-one thousand, five hundred sixty-one".