66669275406878 has 32 divisors (see below), whose sum is σ = 103639685344320. Its totient is φ = 32140131782400.

The previous prime is 66669275406871. The next prime is 66669275406907. The reversal of 66669275406878 is 87860457296666.

66669275406878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66669275406871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2723801 + ... + 11864132.

It is an arithmetic number, because the mean of its divisors is an integer number (3238740167010).

Almost surely, 2^{66669275406878} is an apocalyptic number.

66669275406878 is a deficient number, since it is larger than the sum of its proper divisors (36970409937442).

66669275406878 is a wasteful number, since it uses less digits than its factorization.

66669275406878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588532.

The product of its (nonzero) digits is 8778792960, while the sum is 80.

The spelling of 66669275406878 in words is "sixty-six trillion, six hundred sixty-nine billion, two hundred seventy-five million, four hundred six thousand, eight hundred seventy-eight".