66442243 has 8 divisors (see below), whose sum is σ = 76418912. Its totient is φ = 56586816.

The previous prime is 66442241. The next prime is 66442253. The reversal of 66442243 is 34224466.

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

It is a cyclic number.

It is not a de Polignac number, because 66442243 - 2¹ = 66442241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66442241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29130 + ... + 31327.

It is an arithmetic number, because the mean of its divisors is an integer number (9552364).

Almost surely, 2^66442243 is an apocalyptic number.

66442243 is a deficient number, since it is larger than the sum of its proper divisors (9976669).

66442243 is a wasteful number, since it uses less digits than its factorization.

66442243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60621.

The product of its digits is 27648, while the sum is 31.

The square root of 66442243 is about 8151.2111370029. The cubic root of 66442243 is about 405.0246248300.

The spelling of 66442243 in words is "sixty-six million, four hundred forty-two thousand, two hundred forty-three".