66442323 has 4 divisors (see below), whose sum is σ = 88589768. Its totient is φ = 44294880.

The previous prime is 66442301. The next prime is 66442339. The reversal of 66442323 is 32324466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66442323 - 2⁵ = 66442291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66442823) 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, 11073718 + ... + 11073723.

It is an arithmetic number, because the mean of its divisors is an integer number (22147442).

Almost surely, 2^66442323 is an apocalyptic number.

66442323 is a deficient number, since it is larger than the sum of its proper divisors (22147445).

66442323 is a wasteful number, since it uses less digits than its factorization.

66442323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22147444.

The product of its digits is 20736, while the sum is 30.

The square root of 66442323 is about 8151.2160442476. The cubic root of 66442323 is about 405.0247873870.

Adding to 66442323 its reverse (32324466), we get a palindrome (98766789).

The spelling of 66442323 in words is "sixty-six million, four hundred forty-two thousand, three hundred twenty-three".