664416245524673 has 4 divisors (see below), whose sum is σ = 664422791405568. Its totient is φ = 664409699643780.

The previous prime is 664416245524589. The next prime is 664416245524727. The reversal of 664416245524673 is 376425542614466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664416245524673 - 2⁸ = 664416245524417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664416245520673) 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, 3272788193 + ... + 3272991198.

It is an arithmetic number, because the mean of its divisors is an integer number (166105697851392).

Almost surely, 2^{664416245524673} is an apocalyptic number.

It is an amenable number.

664416245524673 is a deficient number, since it is larger than the sum of its proper divisors (6545880895).

664416245524673 is a wasteful number, since it uses less digits than its factorization.

664416245524673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545880894.

The product of its digits is 696729600, while the sum is 65.

The spelling of 664416245524673 in words is "six hundred sixty-four trillion, four hundred sixteen billion, two hundred forty-five million, five hundred twenty-four thousand, six hundred seventy-three".