12001956678 has 32 divisors (see below), whose sum is σ = 26907055200. Its totient is φ = 3965246208.

The previous prime is 12001956677. The next prime is 12001956697. The reversal of 12001956678 is 87665910021.

12001956678 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 19 + 566 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001956671) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 977343 + ... + 989546.

It is an arithmetic number, because the mean of its divisors is an integer number (840845475).

Almost surely, 2^12001956678 is an apocalyptic number.

12001956678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12001956678 is an abundant number, since it is smaller than the sum of its proper divisors (14905098522).

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

12001956678 is a wasteful number, since it uses less digits than its factorization.

12001956678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967013 (or 1967007 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 12001956678 in words is "twelve billion, one million, nine hundred fifty-six thousand, six hundred seventy-eight".