66444321 has 8 divisors (see below), whose sum is σ = 89506144. Its totient is φ = 43839360.

The previous prime is 66444299. The next prime is 66444359. The reversal of 66444321 is 12344466.

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

It is not a de Polignac number, because 66444321 - 2⁹ = 66443809 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66444221) 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, 113875 + ... + 114456.

It is an arithmetic number, because the mean of its divisors is an integer number (11188268).

Almost surely, 2^66444321 is an apocalyptic number.

It is an amenable number.

66444321 is a deficient number, since it is larger than the sum of its proper divisors (23061823).

66444321 is a wasteful number, since it uses less digits than its factorization.

66444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228431.

The product of its digits is 13824, while the sum is 30.

The square root of 66444321 is about 8151.3386017267. The cubic root of 66444321 is about 405.0288472060.

Adding to 66444321 its reverse (12344466), we get a palindrome (78788787).

The spelling of 66444321 in words is "sixty-six million, four hundred forty-four thousand, three hundred twenty-one".