25605654617 has 2 divisors, whose sum is σ = 25605654618. Its totient is φ = 25605654616.

The previous prime is 25605654533. The next prime is 25605654623. The reversal of 25605654617 is 71645650652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25605120256 + 534361 = 160016^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 25605654617 - 2²⁸ = 25337219161 is a prime.

It is not a weakly prime, because it can be changed into another prime (25605654017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802827308 + 12802827309.

It is an arithmetic number, because the mean of its divisors is an integer number (12802827309).

Almost surely, 2^25605654617 is an apocalyptic number.

It is an amenable number.

25605654617 is a deficient number, since it is larger than the sum of its proper divisors (1).

25605654617 is an equidigital number, since it uses as much as digits as its factorization.

25605654617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 25605654617 in words is "twenty-five billion, six hundred five million, six hundred fifty-four thousand, six hundred seventeen".