12781367168436 has 36 divisors (see below), whose sum is σ = 32472458230212. Its totient is φ = 4238829041664.

The previous prime is 12781367168417. The next prime is 12781367168441. The reversal of 12781367168436 is 63486176318721.

12781367168436 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 1 + 36 + 7 + 168 + 436 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10795127932836 + 1986239235600 = 3285594^2 + 1409340^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 901104525 + ... + 901118708.

It is an arithmetic number, because the mean of its divisors is an integer number (902012728617).

Almost surely, 2^{12781367168436} is an apocalyptic number.

It is an amenable number.

12781367168436 is an abundant number, since it is smaller than the sum of its proper divisors (19691091061776).

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

12781367168436 is a wasteful number, since it uses less digits than its factorization.

12781367168436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802223440 (or 1802223435 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 12781367168436 in words is "twelve trillion, seven hundred eighty-one billion, three hundred sixty-seven million, one hundred sixty-eight thousand, four hundred thirty-six".