25850256128 has 36 divisors (see below), whose sum is σ = 52252734240. Its totient is φ = 12761508864.

The previous prime is 25850256119. The next prime is 25850256139. The reversal of 25850256128 is 82165205852.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618875 + ... + 659322.

It is an arithmetic number, because the mean of its divisors is an integer number (1451464840).

Almost surely, 2^25850256128 is an apocalyptic number.

It is an amenable number.

25850256128 is an abundant number, since it is smaller than the sum of its proper divisors (26402478112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25850256128 is an equidigital number, since it uses as much as digits as its factorization.

25850256128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278292 (or 1278278 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 44.

The spelling of 25850256128 in words is "twenty-five billion, eight hundred fifty million, two hundred fifty-six thousand, one hundred twenty-eight".