664551561105424 has 20 divisors (see below), whose sum is σ = 1317512106611536. Its totient is φ = 324548436818592.

The previous prime is 664551561105407. The next prime is 664551561105449. The reversal of 664551561105424 is 424501165155466.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482958982674 + ... + 482958984049.

Almost surely, 2^{664551561105424} is an apocalyptic number.

It is an amenable number.

664551561105424 is a deficient number, since it is larger than the sum of its proper divisors (652960545506112).

664551561105424 is a wasteful number, since it uses less digits than its factorization.

664551561105424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965917966774 (or 965917966768 counting only the distinct ones).

The product of its (nonzero) digits is 17280000, while the sum is 55.

The spelling of 664551561105424 in words is "six hundred sixty-four trillion, five hundred fifty-one billion, five hundred sixty-one million, one hundred five thousand, four hundred twenty-four".