66544333222 has 4 divisors (see below), whose sum is σ = 99816499836. Its totient is φ = 33272166610.

The previous prime is 66544333181. The next prime is 66544333223. The reversal of 66544333222 is 22233344566.

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

It is a Smith number, since the sum of its digits (40) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544333223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16636083304 + ... + 16636083307.

It is an arithmetic number, because the mean of its divisors is an integer number (24954124959).

Almost surely, 2^66544333222 is an apocalyptic number.

66544333222 is a deficient number, since it is larger than the sum of its proper divisors (33272166614).

66544333222 is a wasteful number, since it uses less digits than its factorization.

66544333222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33272166613.

The product of its digits is 622080, while the sum is 40.

Adding to 66544333222 its reverse (22233344566), we get a palindrome (88777677788).

The spelling of 66544333222 in words is "sixty-six billion, five hundred forty-four million, three hundred thirty-three thousand, two hundred twenty-two".