663881765516 has 12 divisors (see below), whose sum is σ = 1161798866088. Its totient is φ = 331939232352.

The previous prime is 663881765483. The next prime is 663881765543. The reversal of 663881765516 is 615567188366.

663881765516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150055 + ... + 1628001.

It is an arithmetic number, because the mean of its divisors is an integer number (96816572174).

Almost surely, 2^663881765516 is an apocalyptic number.

It is an amenable number.

663881765516 is a deficient number, since it is larger than the sum of its proper divisors (497917100572).

663881765516 is a wasteful number, since it uses less digits than its factorization.

663881765516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825208 (or 825206 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 62.

The spelling of 663881765516 in words is "six hundred sixty-three billion, eight hundred eighty-one million, seven hundred sixty-five thousand, five hundred sixteen".