25961195520 has 768 divisors, whose sum is σ = 103028889600. Its totient is φ = 6157762560.

The previous prime is 25961195503. The next prime is 25961195581. The reversal of 25961195520 is 2559116952.

25961195520 is a `hidden beast` number, since 2 + 5 + 9 + 6 + 119 + 5 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 111421324 + ... + 111421556.

It is an arithmetic number, because the mean of its divisors is an integer number (134152200).

Almost surely, 2^25961195520 is an apocalyptic number.

25961195520 is a gapful number since it is divisible by the number (20) 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 25961195520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51514444800).

25961195520 is an abundant number, since it is smaller than the sum of its proper divisors (77067694080).

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

25961195520 is a wasteful number, since it uses less digits than its factorization.

25961195520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 25961195520 in words is "twenty-five billion, nine hundred sixty-one million, one hundred ninety-five thousand, five hundred twenty".