12543340342 has 32 divisors (see below), whose sum is σ = 20994059520. Its totient is φ = 5581560960.

The previous prime is 12543340331. The next prime is 12543340343. The reversal of 12543340342 is 24304334521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543340343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187888 + ... + 245740.

It is an arithmetic number, because the mean of its divisors is an integer number (656064360).

Almost surely, 2^12543340342 is an apocalyptic number.

12543340342 is a deficient number, since it is larger than the sum of its proper divisors (8450719178).

12543340342 is a wasteful number, since it uses less digits than its factorization.

12543340342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58168.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 12543340342 its reverse (24304334521), we get a palindrome (36847674863).

The spelling of 12543340342 in words is "twelve billion, five hundred forty-three million, three hundred forty thousand, three hundred forty-two".