12947778549619 has 2 divisors, whose sum is σ = 12947778549620. Its totient is φ = 12947778549618.

The previous prime is 12947778549581. The next prime is 12947778549659. The reversal of 12947778549619 is 91694587774921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12947778549619 - 2³³ = 12939188615027 is a prime.

It is a super-2 number, since 2×12947778549619² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12947778549659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6473889274809 + 6473889274810.

It is an arithmetic number, because the mean of its divisors is an integer number (6473889274810).

Almost surely, 2^{12947778549619} is an apocalyptic number.

12947778549619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12947778549619 is an equidigital number, since it uses as much as digits as its factorization.

12947778549619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920360960, while the sum is 79.

The spelling of 12947778549619 in words is "twelve trillion, nine hundred forty-seven billion, seven hundred seventy-eight million, five hundred forty-nine thousand, six hundred nineteen".