664581546664 has 32 divisors (see below), whose sum is σ = 1424152955520. Its totient is φ = 284810734656.

The previous prime is 664581546659. The next prime is 664581546683. The reversal of 664581546664 is 466645185466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545397 + ... + 1928059.

It is an arithmetic number, because the mean of its divisors is an integer number (44504779860).

Almost surely, 2^664581546664 is an apocalyptic number.

It is an amenable number.

664581546664 is an abundant number, since it is smaller than the sum of its proper divisors (759571408856).

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

664581546664 is a wasteful number, since it uses less digits than its factorization.

664581546664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413689 (or 413685 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 61.

The spelling of 664581546664 in words is "six hundred sixty-four billion, five hundred eighty-one million, five hundred forty-six thousand, six hundred sixty-four".