13478378429666 has 8 divisors (see below), whose sum is σ = 20346341961180. Its totient is φ = 6696264442608.

The previous prime is 13478378429647. The next prime is 13478378429699. The reversal of 13478378429666 is 66692487387431.

13478378429666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13115414353441 + 362964076225 = 3621521^2 + 602465^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 13478378429593 and 13478378429602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21462385721 + ... + 21462386348.

Almost surely, 2^{13478378429666} is an apocalyptic number.

13478378429666 is a deficient number, since it is larger than the sum of its proper divisors (6867963531514).

13478378429666 is a wasteful number, since it uses less digits than its factorization.

13478378429666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42924772228.

The product of its digits is 1755758592, while the sum is 74.

The spelling of 13478378429666 in words is "thirteen trillion, four hundred seventy-eight billion, three hundred seventy-eight million, four hundred twenty-nine thousand, six hundred sixty-six".