12947778551668 has 12 divisors (see below), whose sum is σ = 22658648219172. Its totient is φ = 6473879060480.

The previous prime is 12947778551557. The next prime is 12947778551699. The reversal of 12947778551668 is 86615587774921.

It can be written as a sum of positive squares in 2 ways, for example, as 5606865165924 + 7340913385744 = 2367882^2 + 2709412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12947778551594 and 12947778551603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782196 + ... + 5148532.

It is an arithmetic number, because the mean of its divisors is an integer number (1888220684931).

Almost surely, 2^{12947778551668} is an apocalyptic number.

It is an amenable number.

12947778551668 is a deficient number, since it is larger than the sum of its proper divisors (9710869667504).

12947778551668 is a wasteful number, since it uses less digits than its factorization.

12947778551668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107682 (or 5107680 counting only the distinct ones).

The product of its digits is 1422489600, while the sum is 76.

The spelling of 12947778551668 in words is "twelve trillion, nine hundred forty-seven billion, seven hundred seventy-eight million, five hundred fifty-one thousand, six hundred sixty-eight".