66548389 has 2 divisors, whose sum is σ = 66548390. Its totient is φ = 66548388.

The previous prime is 66548369. The next prime is 66548399. The reversal of 66548389 is 98384566.

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., 58522500 + 8025889 = 7650^2 + 2833^2 .

It is a cyclic number.

It is not a de Polignac number, because 66548389 - 2⁵ = 66548357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66548309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33274194 + 33274195.

It is an arithmetic number, because the mean of its divisors is an integer number (33274195).

Almost surely, 2^66548389 is an apocalyptic number.

It is an amenable number.

66548389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66548389 is an equidigital number, since it uses as much as digits as its factorization.

66548389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 49.

The square root of 66548389 is about 8157.7195955733. The cubic root of 66548389 is about 405.2401948655.

The spelling of 66548389 in words is "sixty-six million, five hundred forty-eight thousand, three hundred eighty-nine".