166718793378 has 32 divisors (see below), whose sum is σ = 333951278400. Its totient is φ = 55487367936.

The previous prime is 166718793323. The next prime is 166718793389. The reversal of 166718793378 is 873397817661.

166718793378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 20245950 + ... + 20254182.

It is an arithmetic number, because the mean of its divisors is an integer number (10435977450).

Almost surely, 2^166718793378 is an apocalyptic number.

166718793378 is an abundant number, since it is smaller than the sum of its proper divisors (167232485022).

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

166718793378 is a wasteful number, since it uses less digits than its factorization.

166718793378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026.

The product of its digits is 64012032, while the sum is 66.

The spelling of 166718793378 in words is "one hundred sixty-six billion, seven hundred eighteen million, seven hundred ninety-three thousand, three hundred seventy-eight".