12787843961 has 4 divisors (see below), whose sum is σ = 13460888400. Its totient is φ = 12114799524.

The previous prime is 12787843949. The next prime is 12787843963. The reversal of 12787843961 is 16934878721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12787843961 - 2¹⁰ = 12787842937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12787843897 and 12787843906.

It is not an unprimeable number, because it can be changed into a prime (12787843963) 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, 336522191 + ... + 336522228.

It is an arithmetic number, because the mean of its divisors is an integer number (3365222100).

Almost surely, 2^12787843961 is an apocalyptic number.

It is an amenable number.

12787843961 is a deficient number, since it is larger than the sum of its proper divisors (673044439).

12787843961 is an equidigital number, since it uses as much as digits as its factorization.

12787843961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673044438.

The product of its digits is 4064256, while the sum is 56.

The spelling of 12787843961 in words is "twelve billion, seven hundred eighty-seven million, eight hundred forty-three thousand, nine hundred sixty-one".