12806738991 has 24 divisors (see below), whose sum is σ = 18652720736. Its totient is φ = 8466897600.

The previous prime is 12806738947. The next prime is 12806738993. The reversal of 12806738991 is 19983760821.

It is not a de Polignac number, because 12806738991 - 2⁷ = 12806738863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12806738993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825381 + ... + 840753.

Almost surely, 2^12806738991 is an apocalyptic number.

12806738991 is a deficient number, since it is larger than the sum of its proper divisors (5845981745).

12806738991 is a wasteful number, since it uses less digits than its factorization.

12806738991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16143 (or 16140 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 12806738991 in words is "twelve billion, eight hundred six million, seven hundred thirty-eight thousand, nine hundred ninety-one".