643530250536 has 16 divisors (see below), whose sum is σ = 1608825626400. Its totient is φ = 214510083504.

The previous prime is 643530250511. The next prime is 643530250543. The reversal of 643530250536 is 635052035346.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13406880196 + ... + 13406880243.

It is an arithmetic number, because the mean of its divisors is an integer number (100551601650).

Almost surely, 2^643530250536 is an apocalyptic number.

It is an amenable number.

643530250536 is an abundant number, since it is smaller than the sum of its proper divisors (965295375864).

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

643530250536 is a wasteful number, since it uses less digits than its factorization.

643530250536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26813760448 (or 26813760444 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 42.

The spelling of 643530250536 in words is "six hundred forty-three billion, five hundred thirty million, two hundred fifty thousand, five hundred thirty-six".