664581546663 has 16 divisors (see below), whose sum is σ = 888697232640. Its totient is φ = 441760335104.

The previous prime is 664581546659. The next prime is 664581546683. The reversal of 664581546663 is 366645185466.

664581546663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664581546663 - 2² = 664581546659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664581546597 and 664581546606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664581546683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16880920 + ... + 16920242.

It is an arithmetic number, because the mean of its divisors is an integer number (55543577040).

Almost surely, 2^664581546663 is an apocalyptic number.

664581546663 is a deficient number, since it is larger than the sum of its proper divisors (224115685977).

664581546663 is a wasteful number, since it uses less digits than its factorization.

664581546663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55638.

The product of its digits is 74649600, while the sum is 60.

The spelling of 664581546663 in words is "six hundred sixty-four billion, five hundred eighty-one million, five hundred forty-six thousand, six hundred sixty-three".