66734609 has 2 divisors, whose sum is σ = 66734610. Its totient is φ = 66734608.

The previous prime is 66734497. The next prime is 66734617. The reversal of 66734609 is 90643766.

It is a happy number.

66734609 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., 59336209 + 7398400 = 7703^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 66734609 - 2¹² = 66730513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66734209) 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, 33367304 + 33367305.

It is an arithmetic number, because the mean of its divisors is an integer number (33367305).

Almost surely, 2^66734609 is an apocalyptic number.

It is an amenable number.

66734609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66734609 is an equidigital number, since it uses as much as digits as its factorization.

66734609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 66734609 is about 8169.1253509785. The cubic root of 66734609 is about 405.6178326025.

The spelling of 66734609 in words is "sixty-six million, seven hundred thirty-four thousand, six hundred nine".