166866683687 has 16 divisors (see below), whose sum is σ = 182404991232. Its totient is φ = 151390048320.

The previous prime is 166866683647. The next prime is 166866683713. The reversal of 166866683687 is 786386668661.

166866683687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166866683687 - 2²² = 166862489383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166866683687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166866683647) by changing a digit.

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, 19759688 + ... + 19768130.

It is an arithmetic number, because the mean of its divisors is an integer number (11400311952).

Almost surely, 2^166866683687 is an apocalyptic number.

166866683687 is a deficient number, since it is larger than the sum of its proper divisors (15538307545).

166866683687 is a wasteful number, since it uses less digits than its factorization.

166866683687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11878.

The product of its digits is 501645312, while the sum is 71.

The spelling of 166866683687 in words is "one hundred sixty-six billion, eight hundred sixty-six million, six hundred eighty-three thousand, six hundred eighty-seven".