660506089 has 2 divisors, whose sum is σ = 660506090. Its totient is φ = 660506088.

The previous prime is 660506071. The next prime is 660506107. The reversal of 660506089 is 980605066.

It is a balanced prime because it is at equal distance from previous prime (660506071) and next prime (660506107).

It can be written as a sum of positive squares in only one way, i.e., 562496089 + 98010000 = 23717^2 + 9900^2 .

It is a cyclic number.

It is not a de Polignac number, because 660506089 - 2¹⁷ = 660375017 is a prime.

It is not a weakly prime, because it can be changed into another prime (660506009) 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, 330253044 + 330253045.

It is an arithmetic number, because the mean of its divisors is an integer number (330253045).

Almost surely, 2^660506089 is an apocalyptic number.

It is an amenable number.

660506089 is a deficient number, since it is larger than the sum of its proper divisors (1).

660506089 is an equidigital number, since it uses as much as digits as its factorization.

660506089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 660506089 is about 25700.3130136580. The cubic root of 660506089 is about 870.8812530811.

The spelling of 660506089 in words is "six hundred sixty million, five hundred six thousand, eighty-nine".