25664189 has 2 divisors, whose sum is σ = 25664190. Its totient is φ = 25664188.

The previous prime is 25664183. The next prime is 25664239. The reversal of 25664189 is 98146652.

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., 23863225 + 1800964 = 4885^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 25664189 - 2⁴ = 25664173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25664183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832094 + 12832095.

It is an arithmetic number, because the mean of its divisors is an integer number (12832095).

Almost surely, 2^25664189 is an apocalyptic number.

It is an amenable number.

25664189 is a deficient number, since it is larger than the sum of its proper divisors (1).

25664189 is an equidigital number, since it uses as much as digits as its factorization.

25664189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 25664189 is about 5065.9835175413. The cubic root of 25664189 is about 294.9686416921.

The spelling of 25664189 in words is "twenty-five million, six hundred sixty-four thousand, one hundred eighty-nine".