660917867 has 2 divisors, whose sum is σ = 660917868. Its totient is φ = 660917866.

The previous prime is 660917863. The next prime is 660917879. The reversal of 660917867 is 768719066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660917867 - 2² = 660917863 is a prime.

It is not a weakly prime, because it can be changed into another prime (660917863) 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, 330458933 + 330458934.

It is an arithmetic number, because the mean of its divisors is an integer number (330458934).

Almost surely, 2^660917867 is an apocalyptic number.

660917867 is a deficient number, since it is larger than the sum of its proper divisors (1).

660917867 is an equidigital number, since it uses as much as digits as its factorization.

660917867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 660917867 is about 25708.3229130179. The cubic root of 660917867 is about 871.0621927424.

The spelling of 660917867 in words is "six hundred sixty million, nine hundred seventeen thousand, eight hundred sixty-seven".