642255031220 has 144 divisors (see below), whose sum is σ = 1575682792320. Its totient is φ = 219105596160.

The previous prime is 642255031213. The next prime is 642255031241. The reversal of 642255031220 is 22130552246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4668134 + ... + 4803746.

Almost surely, 2^642255031220 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 642255031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787841396160).

642255031220 is an abundant number, since it is smaller than the sum of its proper divisors (933427761100).

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

642255031220 is a wasteful number, since it uses less digits than its factorization.

642255031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135766 (or 135753 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 642255031220 its reverse (22130552246), we get a palindrome (664385583466).

The spelling of 642255031220 in words is "six hundred forty-two billion, two hundred fifty-five million, thirty-one thousand, two hundred twenty".