635542023544220 has 192 divisors, whose sum is σ = 1495843405701120. Its totient is φ = 225204879578112.

The previous prime is 635542023544187. The next prime is 635542023544223. The reversal of 635542023544220 is 22445320245536.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635542023544223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1087586639 + ... + 1088170841.

It is an arithmetic number, because the mean of its divisors is an integer number (7790851071360).

Almost surely, 2^{635542023544220} 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 635542023544220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747921702850560).

635542023544220 is an abundant number, since it is smaller than the sum of its proper divisors (860301382156900).

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

635542023544220 is a wasteful number, since it uses less digits than its factorization.

635542023544220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585124 (or 585122 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 47.

Adding to 635542023544220 its reverse (22445320245536), we get a palindrome (657987343789756).

The spelling of 635542023544220 in words is "six hundred thirty-five trillion, five hundred forty-two billion, twenty-three million, five hundred forty-four thousand, two hundred twenty".