66440064222 has 72 divisors (see below), whose sum is σ = 168424421256. Its totient is φ = 18873104544.

The previous prime is 66440064199. The next prime is 66440064247. The reversal of 66440064222 is 22246004466.

66440064222 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 0 + 0 + 642 + 2 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65128 + ... + 370299.

It is an arithmetic number, because the mean of its divisors is an integer number (2339228073).

Almost surely, 2^66440064222 is an apocalyptic number.

66440064222 is an abundant number, since it is smaller than the sum of its proper divisors (101984357034).

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

66440064222 is a wasteful number, since it uses less digits than its factorization.

66440064222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435622 (or 435612 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 66440064222 its reverse (22246004466), we get a palindrome (88686068688).

The spelling of 66440064222 in words is "sixty-six billion, four hundred forty million, sixty-four thousand, two hundred twenty-two".