25559331081629 has 2 divisors, whose sum is σ = 25559331081630. Its totient is φ = 25559331081628.

The previous prime is 25559331081601. The next prime is 25559331081631. The reversal of 25559331081629 is 92618013395552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17003062569529 + 8556268512100 = 4123477^2 + 2925110^2 .

It is a cyclic number.

It is not a de Polignac number, because 25559331081629 - 2²⁰ = 25559330033053 is a prime.

It is a super-3 number, since 3×25559331081629³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 25559331081631, 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 (25559331681629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779665540814 + 12779665540815.

It is an arithmetic number, because the mean of its divisors is an integer number (12779665540815).

Almost surely, 2^{25559331081629} is an apocalyptic number.

It is an amenable number.

25559331081629 is a deficient number, since it is larger than the sum of its proper divisors (1).

25559331081629 is an equidigital number, since it uses as much as digits as its factorization.

25559331081629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496000, while the sum is 59.

The spelling of 25559331081629 in words is "twenty-five trillion, five hundred fifty-nine billion, three hundred thirty-one million, eighty-one thousand, six hundred twenty-nine".