660559967 has 2 divisors, whose sum is σ = 660559968. Its totient is φ = 660559966.

The previous prime is 660559943. The next prime is 660559981. The reversal of 660559967 is 769955066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660559967 - 2¹² = 660555871 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660559267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330279983 + 330279984.

It is an arithmetic number, because the mean of its divisors is an integer number (330279984).

Almost surely, 2^660559967 is an apocalyptic number.

660559967 is a deficient number, since it is larger than the sum of its proper divisors (1).

660559967 is an equidigital number, since it uses as much as digits as its factorization.

660559967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3061800, while the sum is 53.

The square root of 660559967 is about 25701.3611896335. The cubic root of 660559967 is about 870.9049319264.

The spelling of 660559967 in words is "six hundred sixty million, five hundred fifty-nine thousand, nine hundred sixty-seven".