65564861 has 2 divisors, whose sum is σ = 65564862. Its totient is φ = 65564860.

The previous prime is 65564843. The next prime is 65564867. The reversal of 65564861 is 16846556.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 23716900 = 6469^2 + 4870^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564861 - 2⁶ = 65564797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65564867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32782430 + 32782431.

It is an arithmetic number, because the mean of its divisors is an integer number (32782431).

Almost surely, 2^65564861 is an apocalyptic number.

It is an amenable number.

65564861 is a deficient number, since it is larger than the sum of its proper divisors (1).

65564861 is an equidigital number, since it uses as much as digits as its factorization.

65564861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 41.

The square root of 65564861 is about 8097.2131625640. The cubic root of 65564861 is about 403.2339111696.

The spelling of 65564861 in words is "sixty-five million, five hundred sixty-four thousand, eight hundred sixty-one".