643310541420 has 144 divisors (see below), whose sum is σ = 1885277460192. Its totient is φ = 163891537920.

The previous prime is 643310541407. The next prime is 643310541427. The reversal of 643310541420 is 24145013346.

It is a happy number.

643310541420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643310541427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27062340 + ... + 27086100.

Almost surely, 2^643310541420 is an apocalyptic number.

643310541420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643310541420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942638730096).

643310541420 is an abundant number, since it is smaller than the sum of its proper divisors (1241966918772).

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

643310541420 is a wasteful number, since it uses less digits than its factorization.

643310541420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24672 (or 24647 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 643310541420 its reverse (24145013346), we get a palindrome (667455554766).

The spelling of 643310541420 in words is "six hundred forty-three billion, three hundred ten million, five hundred forty-one thousand, four hundred twenty".