664075169 has 2 divisors, whose sum is σ = 664075170. Its totient is φ = 664075168.

The previous prime is 664075157. The next prime is 664075183. The reversal of 664075169 is 961570466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 453477025 + 210598144 = 21295^2 + 14512^2 .

It is a cyclic number.

It is not a de Polignac number, because 664075169 - 2¹² = 664071073 is a prime.

It is a super-2 number, since 2×664075169² = 881991660164757122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664075109) 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, 332037584 + 332037585.

It is an arithmetic number, because the mean of its divisors is an integer number (332037585).

Almost surely, 2^664075169 is an apocalyptic number.

It is an amenable number.

664075169 is a deficient number, since it is larger than the sum of its proper divisors (1).

664075169 is an equidigital number, since it uses as much as digits as its factorization.

664075169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 664075169 is about 25769.6559736447. The cubic root of 664075169 is about 872.4470539815.

The spelling of 664075169 in words is "six hundred sixty-four million, seventy-five thousand, one hundred sixty-nine".