25471791856 has 160 divisors (see below), whose sum is σ = 61291077120. Its totient is φ = 10011340800.

The previous prime is 25471791847. The next prime is 25471791871. The reversal of 25471791856 is 65819717452.

It is a junction number, because it is equal to n+sod(n) for n = 25471791797 and 25471791806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11951911 + ... + 11954041.

It is an arithmetic number, because the mean of its divisors is an integer number (383069232).

Almost surely, 2^25471791856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25471791856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30645538560).

25471791856 is an abundant number, since it is smaller than the sum of its proper divisors (35819285264).

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

25471791856 is a wasteful number, since it uses less digits than its factorization.

25471791856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343 (or 2337 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 55.

The spelling of 25471791856 in words is "twenty-five billion, four hundred seventy-one million, seven hundred ninety-one thousand, eight hundred fifty-six".