166560666 has 8 divisors (see below), whose sum is σ = 333121344. Its totient is φ = 55520220.

The previous prime is 166560661. The next prime is 166560673. The reversal of 166560666 is 666065661.

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

166560666 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166560661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13880050 + ... + 13880061.

It is an arithmetic number, because the mean of its divisors is an integer number (41640168).

Almost surely, 2^166560666 is an apocalyptic number.

166560666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166560666 is a wasteful number, since it uses less digits than its factorization.

166560666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27760116.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 166560666 is about 12905.8384462227. The cubic root of 166560666 is about 550.2045145765.

The spelling of 166560666 in words is "one hundred sixty-six million, five hundred sixty thousand, six hundred sixty-six".