25644404016 has 360 divisors, whose sum is σ = 91679649984. Its totient is φ = 6616753920.

The previous prime is 25644403973. The next prime is 25644404041. The reversal of 25644404016 is 61040444652.

25644404016 is a `hidden beast` number, since 2 + 5 + 644 + 4 + 0 + 4 + 0 + 1 + 6 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12650395 + ... + 12652421.

Almost surely, 2^25644404016 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 25644404016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45839824992).

25644404016 is an abundant number, since it is smaller than the sum of its proper divisors (66035245968).

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

25644404016 is a wasteful number, since it uses less digits than its factorization.

25644404016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2213 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 25644404016 its reverse (61040444652), we get a palindrome (86684848668).

The spelling of 25644404016 in words is "twenty-five billion, six hundred forty-four million, four hundred four thousand, sixteen".