660343009 has 2 divisors, whose sum is σ = 660343010. Its totient is φ = 660343008.

The previous prime is 660343003. The next prime is 660343027. The reversal of 660343009 is 900343066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638673984 + 21669025 = 25272^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 660343009 - 2²⁵ = 626788577 is a prime.

It is not a weakly prime, because it can be changed into another prime (660343003) 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, 330171504 + 330171505.

It is an arithmetic number, because the mean of its divisors is an integer number (330171505).

Almost surely, 2^660343009 is an apocalyptic number.

It is an amenable number.

660343009 is a deficient number, since it is larger than the sum of its proper divisors (1).

660343009 is an equidigital number, since it uses as much as digits as its factorization.

660343009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 660343009 is about 25697.1400937925. The cubic root of 660343009 is about 870.8095731944.

The spelling of 660343009 in words is "six hundred sixty million, three hundred forty-three thousand, nine".