25943444340389 has 2 divisors, whose sum is σ = 25943444340390. Its totient is φ = 25943444340388.

The previous prime is 25943444340329. The next prime is 25943444340509. The reversal of 25943444340389 is 98304344434952.

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., 22303045212100 + 3640399128289 = 4722610^2 + 1907983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25943444340389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25943444340329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12971722170194 + 12971722170195.

It is an arithmetic number, because the mean of its divisors is an integer number (12971722170195).

Almost surely, 2^{25943444340389} is an apocalyptic number.

It is an amenable number.

25943444340389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25943444340389 is an equidigital number, since it uses as much as digits as its factorization.

25943444340389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 179159040, while the sum is 62.

The spelling of 25943444340389 in words is "twenty-five trillion, nine hundred forty-three billion, four hundred forty-four million, three hundred forty thousand, three hundred eighty-nine".