25516656 has 120 divisors (see below), whose sum is σ = 79213680. Its totient is φ = 7603200.

The previous prime is 25516651. The next prime is 25516663. The reversal of 25516656 is 65661552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25516656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25516651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 140886 + ... + 141066.

It is an arithmetic number, because the mean of its divisors is an integer number (660114).

Almost surely, 2^25516656 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 25516656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39606840).

25516656 is an abundant number, since it is smaller than the sum of its proper divisors (53697024).

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

25516656 is a wasteful number, since it uses less digits than its factorization.

25516656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 286 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 25516656 is about 5051.4013897136. The cubic root of 25516656 is about 294.4023368395.

Subtracting 25516656 from its reverse (65661552), we obtain a square (40144896 = 6336²).

The spelling of 25516656 in words is "twenty-five million, five hundred sixteen thousand, six hundred fifty-six".