667608559 has 2 divisors, whose sum is σ = 667608560. Its totient is φ = 667608558.

The previous prime is 667608523. The next prime is 667608563. The reversal of 667608559 is 955806766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667608559 - 2¹⁷ = 667477487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667600559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333804279 + 333804280.

It is an arithmetic number, because the mean of its divisors is an integer number (333804280).

Almost surely, 2^667608559 is an apocalyptic number.

667608559 is a deficient number, since it is larger than the sum of its proper divisors (1).

667608559 is an equidigital number, since it uses as much as digits as its factorization.

667608559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The square root of 667608559 is about 25838.1222034420. The cubic root of 667608559 is about 873.9916805077.

The spelling of 667608559 in words is "six hundred sixty-seven million, six hundred eight thousand, five hundred fifty-nine".