664082817223 has 4 divisors (see below), whose sum is σ = 758951791120. Its totient is φ = 569213843328.

The previous prime is 664082817217. The next prime is 664082817257. The reversal of 664082817223 is 322718280466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322718280466 = 2 ⋅161359140233.

It is a cyclic number.

It is not a de Polignac number, because 664082817223 - 2¹⁷ = 664082686151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664082817323) 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, 47434486938 + ... + 47434486951.

It is an arithmetic number, because the mean of its divisors is an integer number (189737947780).

Almost surely, 2^664082817223 is an apocalyptic number.

664082817223 is a deficient number, since it is larger than the sum of its proper divisors (94868973897).

664082817223 is an equidigital number, since it uses as much as digits as its factorization.

664082817223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94868973896.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 664082817223 in words is "six hundred sixty-four billion, eighty-two million, eight hundred seventeen thousand, two hundred twenty-three".