66666666666670 has 32 divisors (see below), whose sum is σ = 137165787758016. Its totient is φ = 22853321088000.

The previous prime is 66666666666647. The next prime is 66666666666737. The reversal of 66666666666670 is 7666666666666.

66666666666670 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 an unprimeable number.

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, 79198531 + ... + 80035870.

It is an arithmetic number, because the mean of its divisors is an integer number (4286430867438).

Almost surely, 2^{66666666666670} is an apocalyptic number.

66666666666670 is an abundant number, since it is smaller than the sum of its proper divisors (70499121091346).

66666666666670 is a wasteful number, since it uses less digits than its factorization.

66666666666670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159240396.

The product of its (nonzero) digits is 15237476352, while the sum is 79.

The spelling of 66666666666670 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred seventy".