12969786646881 has 15 divisors (see below), whose sum is σ = 19374667977313. Its totient is φ = 8646502823100.

The previous prime is 12969786646849. The next prime is 12969786646889. The reversal of 12969786646881 is 18864668796921.

The square root of 12969786646881 is 3601359.

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

12969786646881 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 9 + 78 + 6 + 6 + 468 + 81 = 666.

It is not a de Polignac number, because 12969786646881 - 2⁵ = 12969786646849 is a prime.

It is a super-2 number, since 2×12969786646881² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12969786646881.

It is not an unprimeable number, because it can be changed into a prime (12969786646889) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 32212156 + ... + 32612306.

Almost surely, 2^{12969786646881} is an apocalyptic number.

12969786646881 is the 3601359-th square number.

12969786646881 is the 1800680-th centered octagonal number.

It is an amenable number.

12969786646881 is a deficient number, since it is larger than the sum of its proper divisors (6404881330432).

12969786646881 is an frugal number, since it uses more digits than its factorization.

12969786646881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800314 (or 400154 counting only the distinct ones).

The product of its digits is 3009871872, while the sum is 81.

12969786646881 divided by its sum of digits (81) gives a square (160120822801 = 400151²).

The spelling of 12969786646881 in words is "twelve trillion, nine hundred sixty-nine billion, seven hundred eighty-six million, six hundred forty-six thousand, eight hundred eighty-one".