12543242577 has 4 divisors (see below), whose sum is σ = 16724323440. Its totient is φ = 8362161716.

The previous prime is 12543242567. The next prime is 12543242639. The reversal of 12543242577 is 77524234521.

12543242577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77524234521 = 3 ⋅25841411507.

It is a cyclic number.

It is not a de Polignac number, because 12543242577 - 2⁴ = 12543242561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12543242567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2090540427 + ... + 2090540432.

It is an arithmetic number, because the mean of its divisors is an integer number (4181080860).

Almost surely, 2^12543242577 is an apocalyptic number.

It is an amenable number.

12543242577 is a deficient number, since it is larger than the sum of its proper divisors (4181080863).

12543242577 is an equidigital number, since it uses as much as digits as its factorization.

12543242577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181080862.

The product of its digits is 470400, while the sum is 42.

The spelling of 12543242577 in words is "twelve billion, five hundred forty-three million, two hundred forty-two thousand, five hundred seventy-seven".