1666216171166 has 8 divisors (see below), whose sum is σ = 2499345043104. Its totient is φ = 833101156800.

The previous prime is 1666216171111. The next prime is 1666216171171. The reversal of 1666216171166 is 6611716126661.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 3158390 + ... + 3647993.

It is an arithmetic number, because the mean of its divisors is an integer number (312418130388).

Almost surely, 2^{1666216171166} is an apocalyptic number.

1666216171166 is a deficient number, since it is larger than the sum of its proper divisors (833128871938).

1666216171166 is a wasteful number, since it uses less digits than its factorization.

1666216171166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928786.

The product of its digits is 653184, while the sum is 50.

The spelling of 1666216171166 in words is "one trillion, six hundred sixty-six billion, two hundred sixteen million, one hundred seventy-one thousand, one hundred sixty-six".