664545395522 has 6 divisors (see below), whose sum is σ = 996819822579. Its totient is φ = 332272121330.

The previous prime is 664545395519. The next prime is 664545395537. The reversal of 664545395522 is 225593545466.

It is a happy number.

664545395522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 332272697761 + 332272697761 = 576431^2 + 576431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576431.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 864647 + ... + 1441077.

Almost surely, 2^664545395522 is an apocalyptic number.

664545395522 is a deficient number, since it is larger than the sum of its proper divisors (332274427057).

664545395522 is an frugal number, since it uses more digits than its factorization.

664545395522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152864 (or 576433 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 56.

The spelling of 664545395522 in words is "six hundred sixty-four billion, five hundred forty-five million, three hundred ninety-five thousand, five hundred twenty-two".