65666089 has 2 divisors, whose sum is σ = 65666090. Its totient is φ = 65666088.

The previous prime is 65666057. The next prime is 65666093. The reversal of 65666089 is 98066656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 9715689 = 7480^2 + 3117^2 .

It is a cyclic number.

It is not a de Polignac number, because 65666089 - 2⁵ = 65666057 is a prime.

It is not a weakly prime, because it can be changed into another prime (65646089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32833044 + 32833045.

It is an arithmetic number, because the mean of its divisors is an integer number (32833045).

Almost surely, 2^65666089 is an apocalyptic number.

It is an amenable number.

65666089 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666089 is an equidigital number, since it uses as much as digits as its factorization.

65666089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 65666089 is about 8103.4615443032. The cubic root of 65666089 is about 403.4413270153.

The spelling of 65666089 in words is "sixty-five million, six hundred sixty-six thousand, eighty-nine".