12405543534 has 48 divisors (see below), whose sum is σ = 28304733600. Its totient is φ = 3919088448.

The previous prime is 12405543533. The next prime is 12405543539. The reversal of 12405543534 is 43534550421.

12405543534 is a `hidden beast` number, since 1 + 2 + 40 + 554 + 35 + 34 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405543533) 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 23 ways as a sum of consecutive naturals, for example, 92329 + ... + 182580.

It is an arithmetic number, because the mean of its divisors is an integer number (589681950).

Almost surely, 2^12405543534 is an apocalyptic number.

12405543534 is an abundant number, since it is smaller than the sum of its proper divisors (15899190066).

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

12405543534 is a wasteful number, since it uses less digits than its factorization.

12405543534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275049 (or 275046 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 12405543534 in words is "twelve billion, four hundred five million, five hundred forty-three thousand, five hundred thirty-four".