12543305450 has 24 divisors (see below), whose sum is σ = 25125206988. Its totient is φ = 4631374080.

The previous prime is 12543305387. The next prime is 12543305459. The reversal of 12543305450 is 5450334521.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6376501609 + 6166803841 = 79853^2 + 78529^2 .

It is a super-2 number, since 2×12543305450² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12543305459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9648047 + ... + 9649346.

Almost surely, 2^12543305450 is an apocalyptic number.

12543305450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12543305450 is an abundant number, since it is smaller than the sum of its proper divisors (12581901538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12543305450 is a wasteful number, since it uses less digits than its factorization.

12543305450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19297418 (or 19297413 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 12543305450 its reverse (5450334521), we get a palindrome (17993639971).

The spelling of 12543305450 in words is "twelve billion, five hundred forty-three million, three hundred five thousand, four hundred fifty".