12166161978 has 96 divisors (see below), whose sum is σ = 26268774336. Its totient is φ = 3752736000.

The previous prime is 12166161907. The next prime is 12166161989. The reversal of 12166161978 is 87916166121.

It is a happy number.

12166161978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12529033 + ... + 12530003.

It is an arithmetic number, because the mean of its divisors is an integer number (273633066).

Almost surely, 2^12166161978 is an apocalyptic number.

12166161978 is an abundant number, since it is smaller than the sum of its proper divisors (14102612358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12166161978 is a wasteful number, since it uses less digits than its factorization.

12166161978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1101 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The spelling of 12166161978 in words is "twelve billion, one hundred sixty-six million, one hundred sixty-one thousand, nine hundred seventy-eight".