25856908145 has 4 divisors (see below), whose sum is σ = 31028289780. Its totient is φ = 20685526512.

The previous prime is 25856908127. The next prime is 25856908151. The reversal of 25856908145 is 54180965852.

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 20266654321 + 5590253824 = 142361^2 + 74768^2 .

It is a cyclic number.

It is not a de Polignac number, because 25856908145 - 2¹⁸ = 25856646001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2585690810 + ... + 2585690819.

It is an arithmetic number, because the mean of its divisors is an integer number (7757072445).

Almost surely, 2^25856908145 is an apocalyptic number.

It is an amenable number.

25856908145 is a deficient number, since it is larger than the sum of its proper divisors (5171381635).

25856908145 is an equidigital number, since it uses as much as digits as its factorization.

25856908145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171381634.

The product of its (nonzero) digits is 3456000, while the sum is 53.

The spelling of 25856908145 in words is "twenty-five billion, eight hundred fifty-six million, nine hundred eight thousand, one hundred forty-five".