25558612860 has 96 divisors (see below), whose sum is σ = 78142579200. Its totient is φ = 6190263040.

The previous prime is 25558612853. The next prime is 25558612861. The reversal of 25558612860 is 6821685552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25558612861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 714481 + ... + 749399.

It is an arithmetic number, because the mean of its divisors is an integer number (813985200).

Almost surely, 2^25558612860 is an apocalyptic number.

25558612860 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 25558612860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39071289600).

25558612860 is an abundant number, since it is smaller than the sum of its proper divisors (52583966340).

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

25558612860 is a wasteful number, since it uses less digits than its factorization.

25558612860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36051 (or 36049 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 48.

The spelling of 25558612860 in words is "twenty-five billion, five hundred fifty-eight million, six hundred twelve thousand, eight hundred sixty".