25563565896 has 128 divisors (see below), whose sum is σ = 71320694400. Its totient is φ = 7569735680.

The previous prime is 25563565883. The next prime is 25563565897. The reversal of 25563565896 is 69856536552.

It is not an unprimeable number, because it can be changed into a prime (25563565897) 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 in 31 ways as a sum of consecutive naturals, for example, 3592390 + ... + 3599498.

It is an arithmetic number, because the mean of its divisors is an integer number (557192925).

Almost surely, 2^25563565896 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 25563565896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35660347200).

25563565896 is an abundant number, since it is smaller than the sum of its proper divisors (45757128504).

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

25563565896 is a wasteful number, since it uses less digits than its factorization.

25563565896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439 (or 7435 counting only the distinct ones).

The product of its digits is 58320000, while the sum is 60.

The spelling of 25563565896 in words is "twenty-five billion, five hundred sixty-three million, five hundred sixty-five thousand, eight hundred ninety-six".