660680287 has 2 divisors, whose sum is σ = 660680288. Its totient is φ = 660680286.

The previous prime is 660680281. The next prime is 660680309. The reversal of 660680287 is 782086066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660680287 - 2⁷ = 660680159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660680281) 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, 330340143 + 330340144.

It is an arithmetic number, because the mean of its divisors is an integer number (330340144).

Almost surely, 2^660680287 is an apocalyptic number.

660680287 is a deficient number, since it is larger than the sum of its proper divisors (1).

660680287 is an equidigital number, since it uses as much as digits as its factorization.

660680287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 660680287 is about 25703.7018151083. The cubic root of 660680287 is about 870.9578067220.

The spelling of 660680287 in words is "six hundred sixty million, six hundred eighty thousand, two hundred eighty-seven".