12991926903543 has 40 divisors (see below), whose sum is σ = 22188025335168. Its totient is φ = 7421345998416.

The previous prime is 12991926903541. The next prime is 12991926903583. The reversal of 12991926903543 is 34530962919921.

12991926903543 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 19 + 269 + 0 + 354 + 3 = 666.

It is not a de Polignac number, because 12991926903543 - 2¹ = 12991926903541 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991926903541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2417821 + ... + 5641782.

Almost surely, 2^{12991926903543} is an apocalyptic number.

12991926903543 is a deficient number, since it is larger than the sum of its proper divisors (9196098431625).

12991926903543 is an equidigital number, since it uses as much as digits as its factorization.

12991926903543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8062465 (or 8062456 counting only the distinct ones).

The product of its (nonzero) digits is 28343520, while the sum is 63.

The spelling of 12991926903543 in words is "twelve trillion, nine hundred ninety-one billion, nine hundred twenty-six million, nine hundred three thousand, five hundred forty-three".