12378623166 has 48 divisors (see below), whose sum is σ = 33009666144. Its totient is φ = 3264691392.

The previous prime is 12378623137. The next prime is 12378623203. The reversal of 12378623166 is 66132687321.

12378623166 is a `hidden beast` number, since 1 + 2 + 3 + 7 + 8 + 623 + 16 + 6 = 666.

It is a super-2 number, since 2×12378623166² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3776941 + ... + 3780216.

It is an arithmetic number, because the mean of its divisors is an integer number (687701378).

Almost surely, 2^12378623166 is an apocalyptic number.

12378623166 is an abundant number, since it is smaller than the sum of its proper divisors (20631042978).

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

12378623166 is a wasteful number, since it uses less digits than its factorization.

12378623166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7557185 (or 7557182 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 12378623166 in words is "twelve billion, three hundred seventy-eight million, six hundred twenty-three thousand, one hundred sixty-six".