66442173 has 8 divisors (see below), whose sum is σ = 101245248. Its totient is φ = 37966944.

The previous prime is 66442163. The next prime is 66442177. The reversal of 66442173 is 37124466.

It is a happy number.

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

It is not a de Polignac number, because 66442173 - 2⁴ = 66442157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66442177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581936 + ... + 1581977.

It is an arithmetic number, because the mean of its divisors is an integer number (12655656).

Almost surely, 2^66442173 is an apocalyptic number.

It is an amenable number.

66442173 is a deficient number, since it is larger than the sum of its proper divisors (34803075).

66442173 is a wasteful number, since it uses less digits than its factorization.

66442173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163923.

The product of its digits is 24192, while the sum is 33.

The square root of 66442173 is about 8151.2068431613. The cubic root of 66442173 is about 405.0244825925.

The spelling of 66442173 in words is "sixty-six million, four hundred forty-two thousand, one hundred seventy-three".