12761876891 has 4 divisors (see below), whose sum is σ = 12846392784. Its totient is φ = 12677361000.

The previous prime is 12761876861. The next prime is 12761876903. The reversal of 12761876891 is 19867816721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19867816721 = 409 ⋅48576569.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12761876891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12761876801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42257720 + ... + 42258021.

It is an arithmetic number, because the mean of its divisors is an integer number (3211598196).

Almost surely, 2^12761876891 is an apocalyptic number.

12761876891 is a deficient number, since it is larger than the sum of its proper divisors (84515893).

12761876891 is an equidigital number, since it uses as much as digits as its factorization.

12761876891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84515892.

The product of its digits is 2032128, while the sum is 56.

The spelling of 12761876891 in words is "twelve billion, seven hundred sixty-one million, eight hundred seventy-six thousand, eight hundred ninety-one".