643130310020 has 24 divisors (see below), whose sum is σ = 1473353074368. Its totient is φ = 233865567200.

The previous prime is 643130310013. The next prime is 643130310029. The reversal of 643130310020 is 20013031346.

It is not an unprimeable number, because it can be changed into a prime (643130310029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461659576 + ... + 1461660015.

It is an arithmetic number, because the mean of its divisors is an integer number (61389711432).

Almost surely, 2^643130310020 is an apocalyptic number.

It is an amenable number.

643130310020 is an abundant number, since it is smaller than the sum of its proper divisors (830222764348).

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

643130310020 is a wasteful number, since it uses less digits than its factorization.

643130310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923319611 (or 2923319609 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 643130310020 its reverse (20013031346), we get a palindrome (663143341366).

The spelling of 643130310020 in words is "six hundred forty-three billion, one hundred thirty million, three hundred ten thousand, twenty".