166516166 has 4 divisors (see below), whose sum is σ = 249774252. Its totient is φ = 83258082.

The previous prime is 166516157. The next prime is 166516183. The reversal of 166516166 is 661615661.

It is a happy number.

It is a semiprime because it is the product of two 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 as a sum of consecutive naturals, namely, 41629040 + ... + 41629043.

It is an arithmetic number, because the mean of its divisors is an integer number (62443563).

Almost surely, 2^166516166 is an apocalyptic number.

166516166 is a deficient number, since it is larger than the sum of its proper divisors (83258086).

166516166 is an equidigital number, since it uses as much as digits as its factorization.

166516166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83258085.

The product of its digits is 38880, while the sum is 38.

The square root of 166516166 is about 12904.1143051354. The cubic root of 166516166 is about 550.1555108466.

The spelling of 166516166 in words is "one hundred sixty-six million, five hundred sixteen thousand, one hundred sixty-six".