643306625420 has 24 divisors (see below), whose sum is σ = 1350959233344. Its totient is φ = 257319732096.

The previous prime is 643306625419. The next prime is 643306625447. The reversal of 643306625420 is 24526603346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2877389 + ... + 3092891.

It is an arithmetic number, because the mean of its divisors is an integer number (56289968056).

Almost surely, 2^643306625420 is an apocalyptic number.

It is an amenable number.

643306625420 is an abundant number, since it is smaller than the sum of its proper divisors (707652607924).

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

643306625420 is a wasteful number, since it uses less digits than its factorization.

643306625420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364769 (or 364767 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 643306625420 in words is "six hundred forty-three billion, three hundred six million, six hundred twenty-five thousand, four hundred twenty".