12947778550691 has 2 divisors, whose sum is σ = 12947778550692. Its totient is φ = 12947778550690.

The previous prime is 12947778550667. The next prime is 12947778550703. The reversal of 12947778550691 is 19605587774921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12947778550691 - 2⁶ = 12947778550627 is a prime.

It is not a weakly prime, because it can be changed into another prime (12947778550591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6473889275345 + 6473889275346.

It is an arithmetic number, because the mean of its divisors is an integer number (6473889275346).

Almost surely, 2^{12947778550691} is an apocalyptic number.

12947778550691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12947778550691 is an equidigital number, since it uses as much as digits as its factorization.

12947778550691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 266716800, while the sum is 71.

The spelling of 12947778550691 in words is "twelve trillion, nine hundred forty-seven billion, seven hundred seventy-eight million, five hundred fifty thousand, six hundred ninety-one".