166245666 has 8 divisors (see below), whose sum is σ = 332491344. Its totient is φ = 55415220.

The previous prime is 166245659. The next prime is 166245671. The reversal of 166245666 is 666542661.

It is a happy number.

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

166245666 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13853800 + ... + 13853811.

It is an arithmetic number, because the mean of its divisors is an integer number (41561418).

Almost surely, 2^166245666 is an apocalyptic number.

166245666 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.

166245666 is a wasteful number, since it uses less digits than its factorization.

166245666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27707616.

The product of its digits is 311040, while the sum is 42.

The square root of 166245666 is about 12893.6288918210. The cubic root of 166245666 is about 549.8574462505.

The spelling of 166245666 in words is "one hundred sixty-six million, two hundred forty-five thousand, six hundred sixty-six".