663509881608 has 96 divisors (see below), whose sum is σ = 1991840175360. Its totient is φ = 183458943360.

The previous prime is 663509881607. The next prime is 663509881621. The reversal of 663509881608 is 806188905366.

It is not an unprimeable number, because it can be changed into a prime (663509881607) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9063691 + ... + 9136602.

It is an arithmetic number, because the mean of its divisors is an integer number (20748335160).

Almost surely, 2^663509881608 is an apocalyptic number.

It is an amenable number.

663509881608 is an abundant number, since it is smaller than the sum of its proper divisors (1328330293752).

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

663509881608 is a wasteful number, since it uses less digits than its factorization.

663509881608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18200347 (or 18200336 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 663509881608 in words is "six hundred sixty-three billion, five hundred nine million, eight hundred eighty-one thousand, six hundred eight".