12123561547 has 2 divisors, whose sum is σ = 12123561548. Its totient is φ = 12123561546.

The previous prime is 12123561511. The next prime is 12123561589. The reversal of 12123561547 is 74516532121.

It is a weak prime.

It is an emirp because it is prime and its reverse (74516532121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12123561547 - 2¹⁵ = 12123528779 is a prime.

It is not a weakly prime, because it can be changed into another prime (12123564547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061780773 + 6061780774.

It is an arithmetic number, because the mean of its divisors is an integer number (6061780774).

Almost surely, 2^12123561547 is an apocalyptic number.

12123561547 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123561547 is an equidigital number, since it uses as much as digits as its factorization.

12123561547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The spelling of 12123561547 in words is "twelve billion, one hundred twenty-three million, five hundred sixty-one thousand, five hundred forty-seven".