66280589 has 2 divisors, whose sum is σ = 66280590. Its totient is φ = 66280588.

The previous prime is 66280553. The next prime is 66280601. The reversal of 66280589 is 98508266.

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., 55502500 + 10778089 = 7450^2 + 3283^2 .

It is a cyclic number.

It is not a de Polignac number, because 66280589 - 2¹⁶ = 66215053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66280519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33140294 + 33140295.

It is an arithmetic number, because the mean of its divisors is an integer number (33140295).

Almost surely, 2^66280589 is an apocalyptic number.

It is an amenable number.

66280589 is a deficient number, since it is larger than the sum of its proper divisors (1).

66280589 is an equidigital number, since it uses as much as digits as its factorization.

66280589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 66280589 is about 8141.2891485317. The cubic root of 66280589 is about 404.6958830591.

The spelling of 66280589 in words is "sixty-six million, two hundred eighty thousand, five hundred eighty-nine".