12784311881 has 16 divisors (see below), whose sum is σ = 14581969920. Its totient is φ = 11094581520.

The previous prime is 12784311851. The next prime is 12784311959. The reversal of 12784311881 is 18811348721.

It is not a de Polignac number, because 12784311881 - 2¹⁰ = 12784310857 is a prime.

It is a super-2 number, since 2×12784311881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12784311851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77030 + ... + 177488.

It is an arithmetic number, because the mean of its divisors is an integer number (911373120).

Almost surely, 2^12784311881 is an apocalyptic number.

12784311881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12784311881 is a deficient number, since it is larger than the sum of its proper divisors (1797658039).

12784311881 is a wasteful number, since it uses less digits than its factorization.

12784311881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100996.

The product of its digits is 86016, while the sum is 44.

The spelling of 12784311881 in words is "twelve billion, seven hundred eighty-four million, three hundred eleven thousand, eight hundred eighty-one".