12140543666 has 8 divisors (see below), whose sum is σ = 18509353644. Its totient is φ = 5970759120.

The previous prime is 12140543663. The next prime is 12140543689. The reversal of 12140543666 is 66634504121.

It can be written as a sum of positive squares in 2 ways, for example, as 7964670025 + 4175873641 = 89245^2 + 64621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12140543663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49756205 + ... + 49756448.

Almost surely, 2^12140543666 is an apocalyptic number.

12140543666 is a deficient number, since it is larger than the sum of its proper divisors (6368809978).

12140543666 is an equidigital number, since it uses as much as digits as its factorization.

12140543666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99512716.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 12140543666 in words is "twelve billion, one hundred forty million, five hundred forty-three thousand, six hundred sixty-six".