664786567 has 2 divisors, whose sum is σ = 664786568. Its totient is φ = 664786566.

The previous prime is 664786559. The next prime is 664786589. The reversal of 664786567 is 765687466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664786567 - 2³ = 664786559 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 (664786597) 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, 332393283 + 332393284.

It is an arithmetic number, because the mean of its divisors is an integer number (332393284).

Almost surely, 2^664786567 is an apocalyptic number.

664786567 is a deficient number, since it is larger than the sum of its proper divisors (1).

664786567 is an equidigital number, since it uses as much as digits as its factorization.

664786567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 55.

The square root of 664786567 is about 25783.4552959839. The cubic root of 664786567 is about 872.7584823767.

The spelling of 664786567 in words is "six hundred sixty-four million, seven hundred eighty-six thousand, five hundred sixty-seven".