66450604172176 has 135 divisors (see below), whose sum is σ = 150380224144059. Its totient is φ = 28362912844224.

The previous prime is 66450604172123. The next prime is 66450604172203. The reversal of 66450604172176 is 67127140605466.

The square root of 66450604172176 is 8151724.

It is a perfect power (a square), and thus also a powerful number.

66450604172176 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 in 26 ways as a sum of consecutive naturals, for example, 79202149965 + ... + 79202150803.

Almost surely, 2^{66450604172176} is an apocalyptic number.

66450604172176 is the 8151724-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66450604172176

66450604172176 is an abundant number, since it is smaller than the sum of its proper divisors (83929619971883).

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

66450604172176 is an frugal number, since it uses more digits than its factorization.

66450604172176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 66450604172176 in words is "sixty-six trillion, four hundred fifty billion, six hundred four million, one hundred seventy-two thousand, one hundred seventy-six".