663955540544 has 14 divisors (see below), whose sum is σ = 1317536775894. Its totient is φ = 331977770240.

The previous prime is 663955540513. The next prime is 663955540579. The reversal of 663955540544 is 445045559366.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 660175750144 + 3779790400 = 812512^2 + 61480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 663955540544.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5187152597 + ... + 5187152724.

Almost surely, 2^663955540544 is an apocalyptic number.

663955540544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

663955540544 is a deficient number, since it is larger than the sum of its proper divisors (653581235350).

663955540544 is a wasteful number, since it uses less digits than its factorization.

663955540544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374305333 (or 10374305323 counting only the distinct ones).

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

The spelling of 663955540544 in words is "six hundred sixty-three billion, nine hundred fifty-five million, five hundred forty thousand, five hundred forty-four".