166281666 has 8 divisors (see below), whose sum is σ = 332563344. Its totient is φ = 55427220.

The previous prime is 166281587. The next prime is 166281667. The reversal of 166281666 is 666182661.

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

166281666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (166281667) 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, 13856800 + ... + 13856811.

It is an arithmetic number, because the mean of its divisors is an integer number (41570418).

Almost surely, 2^166281666 is an apocalyptic number.

166281666 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.

166281666 is a wasteful number, since it uses less digits than its factorization.

166281666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27713616.

The product of its digits is 124416, while the sum is 42.

The square root of 166281666 is about 12895.0248545709. The cubic root of 166281666 is about 549.8971333791.

The spelling of 166281666 in words is "one hundred sixty-six million, two hundred eighty-one thousand, six hundred sixty-six".