25181855297117 has 2 divisors, whose sum is σ = 25181855297118. Its totient is φ = 25181855297116.

The previous prime is 25181855297083. The next prime is 25181855297153. The reversal of 25181855297117 is 71179255818152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295522080601 + 9886333216516 = 3910949^2 + 3144254^2 .

It is a cyclic number.

It is not a de Polignac number, because 25181855297117 - 2²⁸ = 25181586861661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25181855297117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25181855897117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12590927648558 + 12590927648559.

It is an arithmetic number, because the mean of its divisors is an integer number (12590927648559).

Almost surely, 2^{25181855297117} is an apocalyptic number.

It is an amenable number.

25181855297117 is a deficient number, since it is larger than the sum of its proper divisors (1).

25181855297117 is an equidigital number, since it uses as much as digits as its factorization.

25181855297117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112000, while the sum is 62.

The spelling of 25181855297117 in words is "twenty-five trillion, one hundred eighty-one billion, eight hundred fifty-five million, two hundred ninety-seven thousand, one hundred seventeen".