12543254545 has 4 divisors (see below), whose sum is σ = 15051905460. Its totient is φ = 10034603632.

The previous prime is 12543254543. The next prime is 12543254617. The reversal of 12543254545 is 54545234521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54545234521 = 11969 ⋅4557209.

It can be written as a sum of positive squares in 2 ways, for example, as 8544968721 + 3998285824 = 92439^2 + 63232^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543254545 - 2¹ = 12543254543 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 12543254498 and 12543254507.

It is not an unprimeable number, because it can be changed into a prime (12543254543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254325450 + ... + 1254325459.

It is an arithmetic number, because the mean of its divisors is an integer number (3762976365).

Almost surely, 2^12543254545 is an apocalyptic number.

It is an amenable number.

12543254545 is a deficient number, since it is larger than the sum of its proper divisors (2508650915).

12543254545 is an equidigital number, since it uses as much as digits as its factorization.

12543254545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508650914.

The product of its digits is 480000, while the sum is 40.

The spelling of 12543254545 in words is "twelve billion, five hundred forty-three million, two hundred fifty-four thousand, five hundred forty-five".