12158322178 has 16 divisors (see below), whose sum is σ = 18304375320. Its totient is φ = 6056902656.

The previous prime is 12158322173. The next prime is 12158322179. The reversal of 12158322178 is 87122385121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6263614449 + 5894707729 = 79143^2 + 76777^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12158322178.

It is not an unprimeable number, because it can be changed into a prime (12158322173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656826 + ... + 675082.

Almost surely, 2^12158322178 is an apocalyptic number.

12158322178 is a deficient number, since it is larger than the sum of its proper divisors (6146053142).

12158322178 is a wasteful number, since it uses less digits than its factorization.

12158322178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19461.

The product of its digits is 53760, while the sum is 40.

The spelling of 12158322178 in words is "twelve billion, one hundred fifty-eight million, three hundred twenty-two thousand, one hundred seventy-eight".