663848660 has 12 divisors (see below), whose sum is σ = 1394082228. Its totient is φ = 265539456.

The previous prime is 663848629. The next prime is 663848729. The reversal of 663848660 is 66848366.

It can be written as a sum of positive squares in 2 ways, for example, as 499701316 + 164147344 = 22354^2 + 12812^2 .

It is a congruent number.

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, 16596197 + ... + 16596236.

It is an arithmetic number, because the mean of its divisors is an integer number (116173519).

Almost surely, 2^663848660 is an apocalyptic number.

It is an amenable number.

663848660 is an abundant number, since it is smaller than the sum of its proper divisors (730233568).

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

663848660 is a wasteful number, since it uses less digits than its factorization.

663848660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33192442 (or 33192440 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 663848660 is about 25765.2607205904. The cubic root of 663848660 is about 872.3478485544.

The spelling of 663848660 in words is "six hundred sixty-three million, eight hundred forty-eight thousand, six hundred sixty".