12666777547 has 2 divisors, whose sum is σ = 12666777548. Its totient is φ = 12666777546.

The previous prime is 12666777517. The next prime is 12666777713. The reversal of 12666777547 is 74577766621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666777547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12666777491 and 12666777500.

It is not a weakly prime, because it can be changed into another prime (12666777517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333388773 + 6333388774.

It is an arithmetic number, because the mean of its divisors is an integer number (6333388774).

Almost surely, 2^12666777547 is an apocalyptic number.

12666777547 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666777547 is an equidigital number, since it uses as much as digits as its factorization.

12666777547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20744640, while the sum is 58.

The spelling of 12666777547 in words is "twelve billion, six hundred sixty-six million, seven hundred seventy-seven thousand, five hundred forty-seven".