12691438822881 has 384 divisors, whose sum is σ = 24688318054400. Its totient is φ = 6231571315200.

The previous prime is 12691438822879. The next prime is 12691438822921. The reversal of 12691438822881 is 18822883419621.

12691438822881 is a `hidden beast` number, since 1 + 26 + 9 + 1 + 4 + 388 + 228 + 8 + 1 = 666.

It is not a de Polignac number, because 12691438822881 - 2¹ = 12691438822879 is a prime.

It is a super-2 number, since 2×12691438822881² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (12691438822831) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 3584137971 + ... + 3584141511.

Almost surely, 2^{12691438822881} is an apocalyptic number.

It is an amenable number.

12691438822881 is a deficient number, since it is larger than the sum of its proper divisors (11996879231519).

12691438822881 is a wasteful number, since it uses less digits than its factorization.

12691438822881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722 (or 3705 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 63.

The spelling of 12691438822881 in words is "twelve trillion, six hundred ninety-one billion, four hundred thirty-eight million, eight hundred twenty-two thousand, eight hundred eighty-one".