166442 has 4 divisors (see below), whose sum is σ = 249666. Its totient is φ = 83220.

The previous prime is 166429. The next prime is 166457. The reversal of 166442 is 244661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244661 = 89 ⋅2749.

It can be written as a sum of positive squares in only one way, i.e., 143641 + 22801 = 379^2 + 151^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41609 + ... + 41612.

2¹⁶⁶⁴⁴² is an apocalyptic number.

166442 is a deficient number, since it is larger than the sum of its proper divisors (83224).

166442 is an equidigital number, since it uses as much as digits as its factorization.

166442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83223.

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

The square root of 166442 is about 407.9730383248. The cubic root of 166442 is about 55.0073819293.

The spelling of 166442 in words is "one hundred sixty-six thousand, four hundred forty-two".