660742289 has 2 divisors, whose sum is σ = 660742290. Its totient is φ = 660742288.

The previous prime is 660742273. The next prime is 660742297. The reversal of 660742289 is 982247066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506610064 + 154132225 = 22508^2 + 12415^2 .

It is a cyclic number.

It is not a de Polignac number, because 660742289 - 2⁴ = 660742273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660744289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330371144 + 330371145.

It is an arithmetic number, because the mean of its divisors is an integer number (330371145).

Almost surely, 2^660742289 is an apocalyptic number.

It is an amenable number.

660742289 is a deficient number, since it is larger than the sum of its proper divisors (1).

660742289 is an equidigital number, since it uses as much as digits as its factorization.

660742289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 660742289 is about 25704.9078776797. The cubic root of 660742289 is about 870.9850510830.

The spelling of 660742289 in words is "six hundred sixty million, seven hundred forty-two thousand, two hundred eighty-nine".