664560557532 has 72 divisors (see below), whose sum is σ = 1785972543264. Its totient is φ = 207890956416.

The previous prime is 664560557503. The next prime is 664560557539. The reversal of 664560557532 is 235755065466.

664560557532 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 60 + 5 + 575 + 3 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664560557539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7527903 + ... + 7615670.

It is an arithmetic number, because the mean of its divisors is an integer number (24805174212).

Almost surely, 2^664560557532 is an apocalyptic number.

It is an amenable number.

664560557532 is an abundant number, since it is smaller than the sum of its proper divisors (1121411985732).

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

664560557532 is a wasteful number, since it uses less digits than its factorization.

664560557532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15143659 (or 15143654 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 54.

The spelling of 664560557532 in words is "six hundred sixty-four billion, five hundred sixty million, five hundred fifty-seven thousand, five hundred thirty-two".