12166205642 has 8 divisors (see below), whose sum is σ = 18250828932. Its totient is φ = 6082596000.

The previous prime is 12166205641. The next prime is 12166205651. The reversal of 12166205642 is 24650266121.

It can be written as a sum of positive squares in 2 ways, for example, as 12154842001 + 11363641 = 110249^2 + 3371^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12166205641) 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, 222659 + ... + 271862.

Almost surely, 2^12166205642 is an apocalyptic number.

12166205642 is a deficient number, since it is larger than the sum of its proper divisors (6084623290).

12166205642 is a wasteful number, since it uses less digits than its factorization.

12166205642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506824.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 12166205642 in words is "twelve billion, one hundred sixty-six million, two hundred five thousand, six hundred forty-two".