642222266320 has 80 divisors (see below), whose sum is σ = 1518910462080. Its totient is φ = 252477384192.

The previous prime is 642222266299. The next prime is 642222266321. The reversal of 642222266320 is 23662222246.

642222266320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 642222266320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642222266321) 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, 2216574 + ... + 2489506.

It is an arithmetic number, because the mean of its divisors is an integer number (18986380776).

Almost surely, 2^642222266320 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 642222266320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759455231040).

642222266320 is an abundant number, since it is smaller than the sum of its proper divisors (876688195760).

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

642222266320 is a wasteful number, since it uses less digits than its factorization.

642222266320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273452 (or 273446 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

Adding to 642222266320 its reverse (23662222246), we get a palindrome (665884488566).

The spelling of 642222266320 in words is "six hundred forty-two billion, two hundred twenty-two million, two hundred sixty-six thousand, three hundred twenty".