66320524273 has 4 divisors (see below), whose sum is σ = 66325820068. Its totient is φ = 66315228480.

The previous prime is 66320524243. The next prime is 66320524279. The reversal of 66320524273 is 37242502366.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50179584064 + 16140940209 = 224008^2 + 127047^2 .

It is a cyclic number.

It is not a de Polignac number, because 66320524273 - 2²⁹ = 65783653361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66320524279) 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, 2629068 + ... + 2654173.

It is an arithmetic number, because the mean of its divisors is an integer number (16581455017).

Almost surely, 2^66320524273 is an apocalyptic number.

It is an amenable number.

66320524273 is a deficient number, since it is larger than the sum of its proper divisors (5295795).

66320524273 is a wasteful number, since it uses less digits than its factorization.

66320524273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5295794.

The product of its (nonzero) digits is 362880, while the sum is 40.

The spelling of 66320524273 in words is "sixty-six billion, three hundred twenty million, five hundred twenty-four thousand, two hundred seventy-three".