166220042 has 8 divisors (see below), whose sum is σ = 250636032. Its totient is φ = 82674700.

The previous prime is 166220023. The next prime is 166220071. The reversal of 166220042 is 240022661.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217184 + ... + 217947.

It is an arithmetic number, because the mean of its divisors is an integer number (31329504).

Almost surely, 2^166220042 is an apocalyptic number.

166220042 is a deficient number, since it is larger than the sum of its proper divisors (84415990).

166220042 is a wasteful number, since it uses less digits than its factorization.

166220042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435324.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 166220042 is about 12892.6351844764. The cubic root of 166220042 is about 549.8291943437.

The spelling of 166220042 in words is "one hundred sixty-six million, two hundred twenty thousand, forty-two".