25925981536 has 384 divisors, whose sum is σ = 68923008000. Its totient is φ = 9510359040.

The previous prime is 25925981503. The next prime is 25925981573. The reversal of 25925981536 is 63518952952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 197908191 + ... + 197908321.

It is an arithmetic number, because the mean of its divisors is an integer number (179487000).

Almost surely, 2^25925981536 is an apocalyptic number.

25925981536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25925981536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34461504000).

25925981536 is an abundant number, since it is smaller than the sum of its proper divisors (42997026464).

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

25925981536 is a wasteful number, since it uses less digits than its factorization.

25925981536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 245 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 55.

The spelling of 25925981536 in words is "twenty-five billion, nine hundred twenty-five million, nine hundred eighty-one thousand, five hundred thirty-six".