664551561105422 has 32 divisors (see below), whose sum is σ = 998637242040000. Its totient is φ = 331672960700928.

The previous prime is 664551561105407. The next prime is 664551561105449. The reversal of 664551561105422 is 224501165155466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30485404079 + ... + 30485425877.

It is an arithmetic number, because the mean of its divisors is an integer number (31207413813750).

Almost surely, 2^{664551561105422} is an apocalyptic number.

664551561105422 is a deficient number, since it is larger than the sum of its proper divisors (334085680934578).

664551561105422 is a wasteful number, since it uses less digits than its factorization.

664551561105422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31580.

The product of its (nonzero) digits is 8640000, while the sum is 53.

The spelling of 664551561105422 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-two".