663631352680 has 16 divisors (see below), whose sum is σ = 1493170543620. Its totient is φ = 265452541056.

The previous prime is 663631352621. The next prime is 663631352693. The reversal of 663631352680 is 86253136366.

It can be written as a sum of positive squares in 2 ways, for example, as 656265250404 + 7366102276 = 810102^2 + 85826^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 8295391869 + ... + 8295391948.

Almost surely, 2^663631352680 is an apocalyptic number.

It is an amenable number.

663631352680 is an abundant number, since it is smaller than the sum of its proper divisors (829539190940).

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

663631352680 is a wasteful number, since it uses less digits than its factorization.

663631352680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16590783828 (or 16590783824 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 49.

The spelling of 663631352680 in words is "six hundred sixty-three billion, six hundred thirty-one million, three hundred fifty-two thousand, six hundred eighty".