643424044004 has 24 divisors (see below), whose sum is σ = 1287582269568. Its totient is φ = 275595837120.

The previous prime is 643424043943. The next prime is 643424044033. The reversal of 643424044004 is 400440424346.

It is a super-2 number, since 2×643424044004² (a number of 24 digits) contains 22 as substring.

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, 6505232 + ... + 6603399.

It is an arithmetic number, because the mean of its divisors is an integer number (53649261232).

Almost surely, 2^643424044004 is an apocalyptic number.

It is an amenable number.

643424044004 is an abundant number, since it is smaller than the sum of its proper divisors (644158225564).

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

643424044004 is a wasteful number, since it uses less digits than its factorization.

643424044004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110395 (or 13110393 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 35.

The spelling of 643424044004 in words is "six hundred forty-three billion, four hundred twenty-four million, forty-four thousand, four".