25861785856 has 135 divisors (see below), whose sum is σ = 56958993651. Its totient is φ = 11717697024.

The previous prime is 25861785839. The next prime is 25861785889. The reversal of 25861785856 is 65858716852.

The square root of 25861785856 is 160816.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25861785794 and 25861785803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1124425461 + ... + 1124425483.

Almost surely, 2^25861785856 is an apocalyptic number.

25861785856 is the 160816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25861785856

25861785856 is an abundant number, since it is smaller than the sum of its proper divisors (31097207795).

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

25861785856 is an frugal number, since it uses more digits than its factorization.

25861785856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 44 counting only the distinct ones).

The product of its digits is 32256000, while the sum is 61.

The spelling of 25861785856 in words is "twenty-five billion, eight hundred sixty-one million, seven hundred eighty-five thousand, eight hundred fifty-six".