25600663620 has 144 divisors (see below), whose sum is σ = 89118277248. Its totient is φ = 5827230720.

The previous prime is 25600663609. The next prime is 25600663661. The reversal of 25600663620 is 2636600652.

25600663620 is a `hidden beast` number, since 2 + 560 + 0 + 66 + 36 + 2 + 0 = 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261507 + ... + 345813.

Almost surely, 2^25600663620 is an apocalyptic number.

25600663620 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 25600663620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44559138624).

25600663620 is an abundant number, since it is smaller than the sum of its proper divisors (63517613628).

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

25600663620 is a wasteful number, since it uses less digits than its factorization.

25600663620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84570 (or 84565 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 25600663620 in words is "twenty-five billion, six hundred million, six hundred sixty-three thousand, six hundred twenty".