25861581005860 has 48 divisors (see below), whose sum is σ = 55467385940736. Its totient is φ = 10124068660992.

The previous prime is 25861581005831. The next prime is 25861581005893. The reversal of 25861581005860 is 6850018516852.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20202859 + ... + 21444781.

It is an arithmetic number, because the mean of its divisors is an integer number (1155570540432).

Almost surely, 2^{25861581005860} is an apocalyptic number.

25861581005860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25861581005860 is an abundant number, since it is smaller than the sum of its proper divisors (29605804934876).

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

25861581005860 is a wasteful number, since it uses less digits than its factorization.

25861581005860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264132 (or 1264130 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 55.

The spelling of 25861581005860 in words is "twenty-five trillion, eight hundred sixty-one billion, five hundred eighty-one million, five thousand, eight hundred sixty".