12947778550668 has 48 divisors (see below), whose sum is σ = 33584973986816. Its totient is φ = 3855417929280.

The previous prime is 12947778550667. The next prime is 12947778550691. The reversal of 12947778550668 is 86605587774921.

It is a self number, because there is not a number n which added to its sum of digits gives 12947778550668.

It is not an unprimeable number, because it can be changed into a prime (12947778550667) 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, 1338681946 + ... + 1338691617.

Almost surely, 2^{12947778550668} is an apocalyptic number.

It is an amenable number.

12947778550668 is an abundant number, since it is smaller than the sum of its proper divisors (20637195436148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12947778550668 is a wasteful number, since it uses less digits than its factorization.

12947778550668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677373614 (or 2677373612 counting only the distinct ones).

The product of its (nonzero) digits is 1422489600, while the sum is 75.

The spelling of 12947778550668 in words is "twelve trillion, nine hundred forty-seven billion, seven hundred seventy-eight million, five hundred fifty thousand, six hundred sixty-eight".