664583325473 has 4 divisors (see below), whose sum is σ = 664658065428. Its totient is φ = 664508585520.

The previous prime is 664583325467. The next prime is 664583325487. The reversal of 664583325473 is 374523385466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 374523385466 = 2 ⋅187261692733.

It can be written as a sum of positive squares in 2 ways, for example, as 385364083729 + 279219241744 = 620777^2 + 528412^2 .

It is a cyclic number.

It is not a de Polignac number, because 664583325473 - 2¹² = 664583321377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664583325173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37356638 + ... + 37374423.

It is an arithmetic number, because the mean of its divisors is an integer number (166164516357).

Almost surely, 2^664583325473 is an apocalyptic number.

It is an amenable number.

664583325473 is a deficient number, since it is larger than the sum of its proper divisors (74739955).

664583325473 is an equidigital number, since it uses as much as digits as its factorization.

664583325473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74739954.

The product of its digits is 43545600, while the sum is 56.

The spelling of 664583325473 in words is "six hundred sixty-four billion, five hundred eighty-three million, three hundred twenty-five thousand, four hundred seventy-three".