25556423856 has 40 divisors (see below), whose sum is σ = 66123837744. Its totient is φ = 8505507840.

The previous prime is 25556423821. The next prime is 25556423869. The reversal of 25556423856 is 65832465552.

It is a junction number, because it is equal to n+sod(n) for n = 25556423799 and 25556423808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384541 + ... + 446076.

Almost surely, 2^25556423856 is an apocalyptic number.

It is an amenable number.

25556423856 is an abundant number, since it is smaller than the sum of its proper divisors (40567413888).

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

25556423856 is a wasteful number, since it uses less digits than its factorization.

25556423856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831269 (or 831263 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 51.

The spelling of 25556423856 in words is "twenty-five billion, five hundred fifty-six million, four hundred twenty-three thousand, eight hundred fifty-six".