663643000 has 64 divisors (see below), whose sum is σ = 1574370720. Its totient is φ = 261792000.

The previous prime is 663642983. The next prime is 663643003. The reversal of 663643000 is 346366.

It is a self number, because there is not a number n which added to its sum of digits gives 663643000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663643003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68455 + ... + 77545.

Almost surely, 2^663643000 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 663643000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787185360).

663643000 is an abundant number, since it is smaller than the sum of its proper divisors (910727720).

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

663643000 is a wasteful number, since it uses less digits than its factorization.

663643000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9185 (or 9171 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 663643000 is about 25761.2693786622. The cubic root of 663643000 is about 872.2577549335.

Adding to 663643000 its reverse (346366), we get a palindrome (663989366).

The spelling of 663643000 in words is "six hundred sixty-three million, six hundred forty-three thousand".