25656541205 has 4 divisors (see below), whose sum is σ = 30787849452. Its totient is φ = 20525232960.

The previous prime is 25656541153. The next prime is 25656541247. The reversal of 25656541205 is 50214565652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14804318929 + 10852222276 = 121673^2 + 104174^2 .

It is not a de Polignac number, because 25656541205 - 2²⁸ = 25388105749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2565654116 + ... + 2565654125.

It is an arithmetic number, because the mean of its divisors is an integer number (7696962363).

Almost surely, 2^25656541205 is an apocalyptic number.

It is an amenable number.

25656541205 is a deficient number, since it is larger than the sum of its proper divisors (5131308247).

25656541205 is an equidigital number, since it uses as much as digits as its factorization.

25656541205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131308246.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 25656541205 in words is "twenty-five billion, six hundred fifty-six million, five hundred forty-one thousand, two hundred five".