25557753052549 has 2 divisors, whose sum is σ = 25557753052550. Its totient is φ = 25557753052548.

The previous prime is 25557753052547. The next prime is 25557753052553. The reversal of 25557753052549 is 94525035775552.

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., 13656757205025 + 11900995847524 = 3695505^2 + 3449782^2 .

It is a cyclic number.

It is not a de Polignac number, because 25557753052549 - 2¹ = 25557753052547 is a prime.

Together with 25557753052547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25557753052543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778876526274 + 12778876526275.

It is an arithmetic number, because the mean of its divisors is an integer number (12778876526275).

Almost surely, 2^{25557753052549} is an apocalyptic number.

It is an amenable number.

25557753052549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25557753052549 is an equidigital number, since it uses as much as digits as its factorization.

25557753052549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 330750000, while the sum is 64.

The spelling of 25557753052549 in words is "twenty-five trillion, five hundred fifty-seven billion, seven hundred fifty-three million, fifty-two thousand, five hundred forty-nine".