166866683686 has 16 divisors (see below), whose sum is σ = 254008739664. Its totient is φ = 82199625984.

The previous prime is 166866683647. The next prime is 166866683713. The reversal of 166866683686 is 686386668661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497635 + ... + 762478.

It is an arithmetic number, because the mean of its divisors is an integer number (15875546229).

Almost surely, 2^166866683686 is an apocalyptic number.

166866683686 is a deficient number, since it is larger than the sum of its proper divisors (87142055978).

166866683686 is a wasteful number, since it uses less digits than its factorization.

166866683686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261095.

The product of its digits is 429981696, while the sum is 70.

The spelling of 166866683686 in words is "one hundred sixty-six billion, eight hundred sixty-six million, six hundred eighty-three thousand, six hundred eighty-six".