643604208198 has 32 divisors (see below), whose sum is σ = 1471236990720. Its totient is φ = 183869209440.

The previous prime is 643604208151. The next prime is 643604208209. The reversal of 643604208198 is 891802406346.

It is a self number, because there is not a number n which added to its sum of digits gives 643604208198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293293 + ... + 1171848.

It is an arithmetic number, because the mean of its divisors is an integer number (45976155960).

Almost surely, 2^643604208198 is an apocalyptic number.

643604208198 is an abundant number, since it is smaller than the sum of its proper divisors (827632782522).

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

643604208198 is a wasteful number, since it uses less digits than its factorization.

643604208198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475612.

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 643604208198 in words is "six hundred forty-three billion, six hundred four million, two hundred eight thousand, one hundred ninety-eight".