25563718656 has 264 divisors, whose sum is σ = 86091907200. Its totient is φ = 7303016448.

The previous prime is 25563718651. The next prime is 25563718657. The reversal of 25563718656 is 65681736552.

It is a happy number.

25563718656 is a `hidden beast` number, since 2 + 5 + 563 + 7 + 18 + 65 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (25563718651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3157045 + ... + 3165131.

Almost surely, 2^25563718656 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 25563718656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43045953600).

25563718656 is an abundant number, since it is smaller than the sum of its proper divisors (60528188544).

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

25563718656 is an equidigital number, since it uses as much as digits as its factorization.

25563718656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8134 (or 8099 counting only the distinct ones).

The product of its digits is 9072000, while the sum is 54.

The spelling of 25563718656 in words is "twenty-five billion, five hundred sixty-three million, seven hundred eighteen thousand, six hundred fifty-six".