25216656 has 40 divisors (see below), whose sum is σ = 66123744. Its totient is φ = 8279040.

The previous prime is 25216613. The next prime is 25216657. The reversal of 25216656 is 65661252.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25216657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705 + ... + 7136.

Almost surely, 2^25216656 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 25216656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33061872).

25216656 is an abundant number, since it is smaller than the sum of its proper divisors (40907088).

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

25216656 is a wasteful number, since it uses less digits than its factorization.

25216656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919 (or 7913 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 25216656 is about 5021.6188624785. The cubic root of 25216656 is about 293.2440201000.

The spelling of 25216656 in words is "twenty-five million, two hundred sixteen thousand, six hundred fifty-six".