66446816416 has 24 divisors (see below), whose sum is σ = 137702285280. Its totient is φ = 31474807488.

The previous prime is 66446816413. The next prime is 66446816417. The reversal of 66446816416 is 61461864466.

66446816416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66446816413) 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, 54643156 + ... + 54644371.

It is an arithmetic number, because the mean of its divisors is an integer number (5737595220).

Almost surely, 2^66446816416 is an apocalyptic number.

It is an amenable number.

66446816416 is an abundant number, since it is smaller than the sum of its proper divisors (71255468864).

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

66446816416 is a wasteful number, since it uses less digits than its factorization.

66446816416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109287556 (or 109287548 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The spelling of 66446816416 in words is "sixty-six billion, four hundred forty-six million, eight hundred sixteen thousand, four hundred sixteen".