663135220 has 96 divisors (see below), whose sum is σ = 1579253760. Its totient is φ = 231795840.

The previous prime is 663135197. The next prime is 663135227. The reversal of 663135220 is 22531366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663135227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 609517 + ... + 610603.

It is an arithmetic number, because the mean of its divisors is an integer number (16450560).

Almost surely, 2^663135220 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 663135220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789626880).

663135220 is an abundant number, since it is smaller than the sum of its proper divisors (916118540).

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

663135220 is a wasteful number, since it uses less digits than its factorization.

663135220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 663135220 is about 25751.4120001215. The cubic root of 663135220 is about 872.0352316517.

Adding to 663135220 its reverse (22531366), we get a palindrome (685666586).

The spelling of 663135220 in words is "six hundred sixty-three million, one hundred thirty-five thousand, two hundred twenty".