13678605666 has 96 divisors (see below), whose sum is σ = 34610284800. Its totient is φ = 3860252640.

The previous prime is 13678605649. The next prime is 13678605679. The reversal of 13678605666 is 66650687631.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191145 + ... + 252771.

It is an arithmetic number, because the mean of its divisors is an integer number (360523800).

Almost surely, 2^13678605666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13678605666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17305142400).

13678605666 is an abundant number, since it is smaller than the sum of its proper divisors (20931679134).

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

13678605666 is a wasteful number, since it uses less digits than its factorization.

13678605666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61724 (or 61721 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 13678605666 in words is "thirteen billion, six hundred seventy-eight million, six hundred five thousand, six hundred sixty-six".