663209140 has 96 divisors (see below), whose sum is σ = 1615977216. Its totient is φ = 226237440.

The previous prime is 663209123. The next prime is 663209177. The reversal of 663209140 is 41902366.

663209140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266944 + ... + 269416.

It is an arithmetic number, because the mean of its divisors is an integer number (16833096).

Almost surely, 2^663209140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663209140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807988608).

663209140 is an abundant number, since it is smaller than the sum of its proper divisors (952768076).

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

663209140 is a wasteful number, since it uses less digits than its factorization.

663209140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 663209140 is about 25752.8472212297. The cubic root of 663209140 is about 872.0676325092.

The spelling of 663209140 in words is "six hundred sixty-three million, two hundred nine thousand, one hundred forty".