25205528794349 has 2 divisors, whose sum is σ = 25205528794350. Its totient is φ = 25205528794348.

The previous prime is 25205528794319. The next prime is 25205528794351. The reversal of 25205528794349 is 94349782550252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17467534818724 + 7737993975625 = 4179418^2 + 2781725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25205528794349 is a prime.

Together with 25205528794351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25205528794319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12602764397174 + 12602764397175.

It is an arithmetic number, because the mean of its divisors is an integer number (12602764397175).

Almost surely, 2^{25205528794349} is an apocalyptic number.

It is an amenable number.

25205528794349 is a deficient number, since it is larger than the sum of its proper divisors (1).

25205528794349 is an equidigital number, since it uses as much as digits as its factorization.

25205528794349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728000, while the sum is 65.

The spelling of 25205528794349 in words is "twenty-five trillion, two hundred five billion, five hundred twenty-eight million, seven hundred ninety-four thousand, three hundred forty-nine".