25805539776 has 224 divisors, whose sum is σ = 77876156160. Its totient is φ = 7490617344.

The previous prime is 25805539729. The next prime is 25805539801. The reversal of 25805539776 is 67793550852.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

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, 2661850 + ... + 2671526.

Almost surely, 2^25805539776 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 25805539776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38938078080).

25805539776 is an abundant number, since it is smaller than the sum of its proper divisors (52070616384).

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

25805539776 is a wasteful number, since it uses less digits than its factorization.

25805539776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9771 (or 9761 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 57.

The spelling of 25805539776 in words is "twenty-five billion, eight hundred five million, five hundred thirty-nine thousand, seven hundred seventy-six".