642588021330 has 64 divisors (see below), whose sum is σ = 1568445742080. Its totient is φ = 168452374464.

The previous prime is 642588021311. The next prime is 642588021343. The reversal of 642588021330 is 33120885246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 650641 + ... + 1307099.

It is an arithmetic number, because the mean of its divisors is an integer number (24506964720).

Almost surely, 2^642588021330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642588021330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784222871040).

642588021330 is an abundant number, since it is smaller than the sum of its proper divisors (925857720750).

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

642588021330 is a wasteful number, since it uses less digits than its factorization.

642588021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657023.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 642588021330 in words is "six hundred forty-two billion, five hundred eighty-eight million, twenty-one thousand, three hundred thirty".