12855844787 has 4 divisors (see below), whose sum is σ = 12874834896. Its totient is φ = 12836854680.

The previous prime is 12855844783. The next prime is 12855844823. The reversal of 12855844787 is 78744855821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78744855821 = 173 ⋅455172577.

It is a cyclic number.

It is not a de Polignac number, because 12855844787 - 2² = 12855844783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12855844783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9494039 + ... + 9495392.

It is an arithmetic number, because the mean of its divisors is an integer number (3218708724).

Almost surely, 2^12855844787 is an apocalyptic number.

12855844787 is a deficient number, since it is larger than the sum of its proper divisors (18990109).

12855844787 is an equidigital number, since it uses as much as digits as its factorization.

12855844787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18990108.

The product of its digits is 20070400, while the sum is 59.

The spelling of 12855844787 in words is "twelve billion, eight hundred fifty-five million, eight hundred forty-four thousand, seven hundred eighty-seven".