12565268256820 has 12 divisors (see below), whose sum is σ = 26387063339364. Its totient is φ = 5026107302720.

The previous prime is 12565268256817. The next prime is 12565268256859. The reversal of 12565268256820 is 2865286256521.

12565268256820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2742773201424 + 9822495055396 = 1656132^2 + 3134086^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314131706401 + ... + 314131706440.

It is an arithmetic number, because the mean of its divisors is an integer number (2198921944947).

Almost surely, 2^{12565268256820} is an apocalyptic number.

12565268256820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12565268256820 is an abundant number, since it is smaller than the sum of its proper divisors (13821795082544).

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

12565268256820 is a wasteful number, since it uses less digits than its factorization.

12565268256820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628263412850 (or 628263412848 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 58.

The spelling of 12565268256820 in words is "twelve trillion, five hundred sixty-five billion, two hundred sixty-eight million, two hundred fifty-six thousand, eight hundred twenty".