66442183 has 4 divisors (see below), whose sum is σ = 69939160. Its totient is φ = 62945208.

The previous prime is 66442177. The next prime is 66442199. The reversal of 66442183 is 38124466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38124466 = 2 ⋅19062233.

It is a cyclic number.

It is not a de Polignac number, because 66442183 - 2⁵ = 66442151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66442133) 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, 1748460 + ... + 1748497.

It is an arithmetic number, because the mean of its divisors is an integer number (17484790).

Almost surely, 2^66442183 is an apocalyptic number.

66442183 is a deficient number, since it is larger than the sum of its proper divisors (3496977).

66442183 is a wasteful number, since it uses less digits than its factorization.

66442183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496976.

The product of its digits is 27648, while the sum is 34.

The square root of 66442183 is about 8151.2074565674. The cubic root of 66442183 is about 405.0245029122.

The spelling of 66442183 in words is "sixty-six million, four hundred forty-two thousand, one hundred eighty-three".