664023454189 has 2 divisors, whose sum is σ = 664023454190. Its totient is φ = 664023454188.

The previous prime is 664023454183. The next prime is 664023454253. The reversal of 664023454189 is 981454320466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663711649225 + 311804964 = 814685^2 + 17658^2 .

It is a cyclic number.

It is not a de Polignac number, because 664023454189 - 2³⁹ = 114267640301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664023454183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332011727094 + 332011727095.

It is an arithmetic number, because the mean of its divisors is an integer number (332011727095).

Almost surely, 2^664023454189 is an apocalyptic number.

It is an amenable number.

664023454189 is a deficient number, since it is larger than the sum of its proper divisors (1).

664023454189 is an equidigital number, since it uses as much as digits as its factorization.

664023454189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 664023454189 in words is "six hundred sixty-four billion, twenty-three million, four hundred fifty-four thousand, one hundred eighty-nine".