12947778551667 has 8 divisors (see below), whose sum is σ = 18279216778896. Its totient is φ = 8124096346112.

The previous prime is 12947778551557. The next prime is 12947778551699. The reversal of 12947778551667 is 76615587774921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12947778551667 - 2¹¹ = 12947778549619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12947778550667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126939005358 + ... + 126939005459.

It is an arithmetic number, because the mean of its divisors is an integer number (2284902097362).

Almost surely, 2^{12947778551667} is an apocalyptic number.

12947778551667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12947778551667 is a deficient number, since it is larger than the sum of its proper divisors (5331438227229).

12947778551667 is a wasteful number, since it uses less digits than its factorization.

12947778551667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253878010837.

The product of its digits is 1244678400, while the sum is 75.

The spelling of 12947778551667 in words is "twelve trillion, nine hundred forty-seven billion, seven hundred seventy-eight million, five hundred fifty-one thousand, six hundred sixty-seven".