663555072 has 88 divisors (see below), whose sum is σ = 1798117552. Its totient is φ = 217497600.

The previous prime is 663555041. The next prime is 663555089. The reversal of 663555072 is 270555366.

It is a self number, because there is not a number n which added to its sum of digits gives 663555072.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185622 + ... + 189162.

It is an arithmetic number, because the mean of its divisors is an integer number (20433154).

Almost surely, 2^663555072 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 663555072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899058776).

663555072 is an abundant number, since it is smaller than the sum of its proper divisors (1134562480).

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

663555072 is a wasteful number, since it uses less digits than its factorization.

663555072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 39.

The square root of 663555072 is about 25759.5627292080. The cubic root of 663555072 is about 872.2192305726.

The spelling of 663555072 in words is "six hundred sixty-three million, five hundred fifty-five thousand, seventy-two".