166685166835 has 16 divisors (see below), whose sum is σ = 218230693632. Its totient is φ = 121211877600.

The previous prime is 166685166811. The next prime is 166685166871. The reversal of 166685166835 is 538661586661.

It is not a de Polignac number, because 166685166835 - 2²³ = 166676778227 is a prime.

It is a Duffinian 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, 333322 + ... + 666688.

It is an arithmetic number, because the mean of its divisors is an integer number (13639418352).

Almost surely, 2^166685166835 is an apocalyptic number.

166685166835 is a deficient number, since it is larger than the sum of its proper divisors (51545526797).

166685166835 is a wasteful number, since it uses less digits than its factorization.

166685166835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342474.

The product of its digits is 37324800, while the sum is 61.

The spelling of 166685166835 in words is "one hundred sixty-six billion, six hundred eighty-five million, one hundred sixty-six thousand, eight hundred thirty-five".