12878684641 has 2 divisors, whose sum is σ = 12878684642. Its totient is φ = 12878684640.

The previous prime is 12878684639. The next prime is 12878684647. The reversal of 12878684641 is 14648687821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12432250000 + 446434641 = 111500^2 + 21129^2 .

It is an emirp because it is prime and its reverse (14648687821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12878684641 - 2¹ = 12878684639 is a prime.

Together with 12878684639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12878684647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6439342320 + 6439342321.

It is an arithmetic number, because the mean of its divisors is an integer number (6439342321).

Almost surely, 2^12878684641 is an apocalyptic number.

It is an amenable number.

12878684641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12878684641 is an equidigital number, since it uses as much as digits as its factorization.

12878684641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4128768, while the sum is 55.

The spelling of 12878684641 in words is "twelve billion, eight hundred seventy-eight million, six hundred eighty-four thousand, six hundred forty-one".