66364615663273 has 4 divisors (see below), whose sum is σ = 70268416584660. Its totient is φ = 62460814741888.

The previous prime is 66364615663261. The next prime is 66364615663303. The reversal of 66364615663273 is 37236651646366.

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 48510500642704 + 17854115020569 = 6964948^2 + 4225413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66364615663273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66364615663223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951900460668 + ... + 1951900460701.

It is an arithmetic number, because the mean of its divisors is an integer number (17567104146165).

Almost surely, 2^{66364615663273} is an apocalyptic number.

It is an amenable number.

66364615663273 is a deficient number, since it is larger than the sum of its proper divisors (3903800921387).

66364615663273 is a wasteful number, since it uses less digits than its factorization.

66364615663273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903800921386.

The product of its digits is 352719360, while the sum is 64.

The spelling of 66364615663273 in words is "sixty-six trillion, three hundred sixty-four billion, six hundred fifteen million, six hundred sixty-three thousand, two hundred seventy-three".