25555613606597 has 2 divisors, whose sum is σ = 25555613606598. Its totient is φ = 25555613606596.

The previous prime is 25555613606503. The next prime is 25555613606599. The reversal of 25555613606597 is 79560631655552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24971747986276 + 583865620321 = 4997174^2 + 764111^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555613606597 - 2²⁸ = 25555345171141 is a prime.

Together with 25555613606599, 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 (25555613606599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777806803298 + 12777806803299.

It is an arithmetic number, because the mean of its divisors is an integer number (12777806803299).

Almost surely, 2^{25555613606597} is an apocalyptic number.

It is an amenable number.

25555613606597 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555613606597 is an equidigital number, since it uses as much as digits as its factorization.

25555613606597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 255150000, while the sum is 65.

The spelling of 25555613606597 in words is "twenty-five trillion, five hundred fifty-five billion, six hundred thirteen million, six hundred six thousand, five hundred ninety-seven".