643503602504 has 16 divisors (see below), whose sum is σ = 1378936291200. Its totient is φ = 275787258192.

The previous prime is 643503602503. The next prime is 643503602551. The reversal of 643503602504 is 405206305346.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (643503602503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5745567824 + ... + 5745567935.

It is an arithmetic number, because the mean of its divisors is an integer number (86183518200).

Almost surely, 2^643503602504 is an apocalyptic number.

It is an amenable number.

643503602504 is an abundant number, since it is smaller than the sum of its proper divisors (735432688696).

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

643503602504 is a wasteful number, since it uses less digits than its factorization.

643503602504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11491135772 (or 11491135768 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 38.

The spelling of 643503602504 in words is "six hundred forty-three billion, five hundred three million, six hundred two thousand, five hundred four".