66644266228 has 12 divisors (see below), whose sum is σ = 119472038532. Its totient is φ = 32509398080.

The previous prime is 66644266223. The next prime is 66644266229. The reversal of 66644266228 is 82266244666.

It can be written as a sum of positive squares in 2 ways, for example, as 15109818084 + 51534448144 = 122922^2 + 227012^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644266223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203183575 + ... + 203183902.

It is an arithmetic number, because the mean of its divisors is an integer number (9956003211).

Almost surely, 2^66644266228 is an apocalyptic number.

It is an amenable number.

66644266228 is a deficient number, since it is larger than the sum of its proper divisors (52827772304).

66644266228 is a wasteful number, since it uses less digits than its factorization.

66644266228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406367522 (or 406367520 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 52.

The spelling of 66644266228 in words is "sixty-six billion, six hundred forty-four million, two hundred sixty-six thousand, two hundred twenty-eight".