664710623667522 has 64 divisors (see below), whose sum is σ = 1496118931776000. Its totient is φ = 218726816760144.

The previous prime is 664710623667487. The next prime is 664710623667529. The reversal of 664710623667522 is 225766326017466.

664710623667522 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 10 + 6 + 2 + 36 + 67 + 522 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 664710623667522.

It is not an unprimeable number, because it can be changed into a prime (664710623667529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53255772 + ... + 64541447.

It is an arithmetic number, because the mean of its divisors is an integer number (23376858309000).

Almost surely, 2^{664710623667522} is an apocalyptic number.

664710623667522 is an abundant number, since it is smaller than the sum of its proper divisors (831408308108478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664710623667522 is a wasteful number, since it uses less digits than its factorization.

664710623667522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117798572 (or 117798566 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 63.

The spelling of 664710623667522 in words is "six hundred sixty-four trillion, seven hundred ten billion, six hundred twenty-three million, six hundred sixty-seven thousand, five hundred twenty-two".