12666777678 has 32 divisors (see below), whose sum is σ = 28161169920. Its totient is φ = 4220343000.

The previous prime is 12666777547. The next prime is 12666777713. The reversal of 12666777678 is 87677766621.

It is a happy number.

12666777678 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69451 + ... + 173657.

It is an arithmetic number, because the mean of its divisors is an integer number (880036560).

Almost surely, 2^12666777678 is an apocalyptic number.

12666777678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12666777678 is an abundant number, since it is smaller than the sum of its proper divisors (15494392242).

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

12666777678 is a wasteful number, since it uses less digits than its factorization.

12666777678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106469 (or 106463 counting only the distinct ones).

The product of its digits is 49787136, while the sum is 63.

The spelling of 12666777678 in words is "twelve billion, six hundred sixty-six million, seven hundred seventy-seven thousand, six hundred seventy-eight".