12981718819 has 2 divisors, whose sum is σ = 12981718820. Its totient is φ = 12981718818.

The previous prime is 12981718807. The next prime is 12981718853. The reversal of 12981718819 is 91881718921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12981718819 - 2⁵ = 12981718787 is a prime.

It is a super-2 number, since 2×12981718819² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12981718819.

It is not a weakly prime, because it can be changed into another prime (12981718889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6490859409 + 6490859410.

It is an arithmetic number, because the mean of its divisors is an integer number (6490859410).

Almost surely, 2^12981718819 is an apocalyptic number.

12981718819 is a deficient number, since it is larger than the sum of its proper divisors (1).

12981718819 is an equidigital number, since it uses as much as digits as its factorization.

12981718819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 55.

The spelling of 12981718819 in words is "twelve billion, nine hundred eighty-one million, seven hundred eighteen thousand, eight hundred nineteen".