66644322 has 8 divisors (see below), whose sum is σ = 133288656. Its totient is φ = 22214772.

The previous prime is 66644309. The next prime is 66644323. The reversal of 66644322 is 22344666.

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

66644322 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66644323) 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, 5553688 + ... + 5553699.

It is an arithmetic number, because the mean of its divisors is an integer number (16661082).

Almost surely, 2^66644322 is an apocalyptic number.

66644322 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66644322 is a wasteful number, since it uses less digits than its factorization.

66644322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107392.

The product of its digits is 41472, while the sum is 33.

The square root of 66644322 is about 8163.5973688075. The cubic root of 66644322 is about 405.4348263840.

Adding to 66644322 its reverse (22344666), we get a palindrome (88988988).

It can be divided in two parts, 66644 and 322, that added together give a palindrome (66966).

The spelling of 66644322 in words is "sixty-six million, six hundred forty-four thousand, three hundred twenty-two".