664444675335775 has 24 divisors (see below), whose sum is σ = 841453209244224. Its totient is φ = 520238759040000.

The previous prime is 664444675335733. The next prime is 664444675335821. The reversal of 664444675335775 is 577533576444466.

It is not a de Polignac number, because 664444675335775 - 2⁹ = 664444675335263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80762775 + ... + 88608775.

It is an arithmetic number, because the mean of its divisors is an integer number (35060550385176).

Almost surely, 2^{664444675335775} is an apocalyptic number.

664444675335775 is a deficient number, since it is larger than the sum of its proper divisors (177008533908449).

664444675335775 is a wasteful number, since it uses less digits than its factorization.

664444675335775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918131 (or 7918126 counting only the distinct ones).

The product of its digits is 21337344000, while the sum is 76.

The spelling of 664444675335775 in words is "six hundred sixty-four trillion, four hundred forty-four billion, six hundred seventy-five million, three hundred thirty-five thousand, seven hundred seventy-five".