12543661311 has 16 divisors (see below), whose sum is σ = 17017326720. Its totient is φ = 8216368160.

The previous prime is 12543661303. The next prime is 12543661313. The reversal of 12543661311 is 11316634521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12543661311 - 2³ = 12543661303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543661313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336841 + ... + 372221.

It is an arithmetic number, because the mean of its divisors is an integer number (1063582920).

Almost surely, 2^12543661311 is an apocalyptic number.

12543661311 is a deficient number, since it is larger than the sum of its proper divisors (4473665409).

12543661311 is a wasteful number, since it uses less digits than its factorization.

12543661311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37446.

The product of its digits is 12960, while the sum is 33.

The spelling of 12543661311 in words is "twelve billion, five hundred forty-three million, six hundred sixty-one thousand, three hundred eleven".