664510169 has 2 divisors, whose sum is σ = 664510170. Its totient is φ = 664510168.

The previous prime is 664510163. The next prime is 664510177. The reversal of 664510169 is 961015466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538240000 + 126270169 = 23200^2 + 11237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664510169 is a prime.

It is a super-2 number, since 2×664510169² = 883147529408817122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664510163) 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, 332255084 + 332255085.

It is an arithmetic number, because the mean of its divisors is an integer number (332255085).

Almost surely, 2^664510169 is an apocalyptic number.

It is an amenable number.

664510169 is a deficient number, since it is larger than the sum of its proper divisors (1).

664510169 is an equidigital number, since it uses as much as digits as its factorization.

664510169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 664510169 is about 25778.0947511642. The cubic root of 664510169 is about 872.6375101476.

The spelling of 664510169 in words is "six hundred sixty-four million, five hundred ten thousand, one hundred sixty-nine".