166686566838 has 32 divisors (see below), whose sum is σ = 382820826240. Its totient is φ = 47852602560.

The previous prime is 166686566807. The next prime is 166686566867. The reversal of 166686566838 is 838665686661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66460695 + ... + 66463202.

It is an arithmetic number, because the mean of its divisors is an integer number (11963150820).

Almost surely, 2^166686566838 is an apocalyptic number.

166686566838 is an abundant number, since it is smaller than the sum of its proper divisors (216134259402).

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

166686566838 is a wasteful number, since it uses less digits than its factorization.

166686566838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132923932.

The product of its digits is 358318080, while the sum is 69.

The spelling of 166686566838 in words is "one hundred sixty-six billion, six hundred eighty-six million, five hundred sixty-six thousand, eight hundred thirty-eight".