25605264173 has 2 divisors, whose sum is σ = 25605264174. Its totient is φ = 25605264172.

The previous prime is 25605264163. The next prime is 25605264227. The reversal of 25605264173 is 37146250652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24988337929 + 616926244 = 158077^2 + 24838^2 .

It is a cyclic number.

It is not a de Polignac number, because 25605264173 - 2⁸ = 25605263917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25605264173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25605264103) 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, 12802632086 + 12802632087.

It is an arithmetic number, because the mean of its divisors is an integer number (12802632087).

Almost surely, 2^25605264173 is an apocalyptic number.

It is an amenable number.

25605264173 is a deficient number, since it is larger than the sum of its proper divisors (1).

25605264173 is an equidigital number, since it uses as much as digits as its factorization.

25605264173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 25605264173 in words is "twenty-five billion, six hundred five million, two hundred sixty-four thousand, one hundred seventy-three".