12166921836434 has 4 divisors (see below), whose sum is σ = 18250382754654. Its totient is φ = 6083460918216.

The previous prime is 12166921836373. The next prime is 12166921836473. The reversal of 12166921836434 is 43463812966121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11545894305625 + 621027530809 = 3397925^2 + 788053^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12166921836434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3041730459107 + ... + 3041730459110.

Almost surely, 2^{12166921836434} is an apocalyptic number.

12166921836434 is a deficient number, since it is larger than the sum of its proper divisors (6083460918220).

12166921836434 is an equidigital number, since it uses as much as digits as its factorization.

12166921836434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6083460918219.

The product of its digits is 8957952, while the sum is 56.

The spelling of 12166921836434 in words is "twelve trillion, one hundred sixty-six billion, nine hundred twenty-one million, eight hundred thirty-six thousand, four hundred thirty-four".