25805558016 has 432 divisors, whose sum is σ = 92853196800. Its totient is φ = 6982723584.

The previous prime is 25805558011. The next prime is 25805558047. The reversal of 25805558016 is 61085550852.

25805558016 is a `hidden beast` number, since 2 + 5 + 8 + 0 + 55 + 580 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is not an unprimeable number, because it can be changed into a prime (25805558011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8272105 + ... + 8275223.

Almost surely, 2^25805558016 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 25805558016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46426598400).

25805558016 is an abundant number, since it is smaller than the sum of its proper divisors (67047638784).

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

25805558016 is an equidigital number, since it uses as much as digits as its factorization.

25805558016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 3150 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 45.

The spelling of 25805558016 in words is "twenty-five billion, eight hundred five million, five hundred fifty-eight thousand, sixteen".