12143545681 has 24 divisors (see below), whose sum is σ = 13035804480. Its totient is φ = 11290730880.

The previous prime is 12143545679. The next prime is 12143545691. The reversal of 12143545681 is 18654534121.

It is not a de Polignac number, because 12143545681 - 2¹ = 12143545679 is a prime.

It is a super-2 number, since 2×12143545681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12143545651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17127355 + ... + 17128063.

It is an arithmetic number, because the mean of its divisors is an integer number (543158520).

Almost surely, 2^12143545681 is an apocalyptic number.

It is an amenable number.

12143545681 is a deficient number, since it is larger than the sum of its proper divisors (892258799).

12143545681 is an equidigital number, since it uses as much as digits as its factorization.

12143545681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257 (or 1216 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The spelling of 12143545681 in words is "twelve billion, one hundred forty-three million, five hundred forty-five thousand, six hundred eighty-one".