25943198497 has 2 divisors, whose sum is σ = 25943198498. Its totient is φ = 25943198496.

The previous prime is 25943198459. The next prime is 25943198549. The reversal of 25943198497 is 79489134952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18980297361 + 6962901136 = 137769^2 + 83444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25943198497 is a prime.

It is not a weakly prime, because it can be changed into another prime (25943198447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12971599248 + 12971599249.

It is an arithmetic number, because the mean of its divisors is an integer number (12971599249).

Almost surely, 2^25943198497 is an apocalyptic number.

It is an amenable number.

25943198497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25943198497 is an equidigital number, since it uses as much as digits as its factorization.

25943198497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The spelling of 25943198497 in words is "twenty-five billion, nine hundred forty-three million, one hundred ninety-eight thousand, four hundred ninety-seven".