65561893 has 2 divisors, whose sum is σ = 65561894. Its totient is φ = 65561892.

The previous prime is 65561861. The next prime is 65561917. The reversal of 65561893 is 39816556.

65561893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65561409 + 484 = 8097^2 + 22^2 .

It is a cyclic number.

It is not a de Polignac number, because 65561893 - 2⁵ = 65561861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65561813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780946 + 32780947.

It is an arithmetic number, because the mean of its divisors is an integer number (32780947).

Almost surely, 2^65561893 is an apocalyptic number.

It is an amenable number.

65561893 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561893 is an equidigital number, since it uses as much as digits as its factorization.

65561893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 65561893 is about 8097.0298875575. The cubic root of 65561893 is about 403.2278265267.

The spelling of 65561893 in words is "sixty-five million, five hundred sixty-one thousand, eight hundred ninety-three".