643604208199 has 16 divisors (see below), whose sum is σ = 659309140800. Its totient is φ = 628083624960.

The previous prime is 643604208151. The next prime is 643604208209. The reversal of 643604208199 is 991802406346.

It is a cyclic number.

It is not a de Polignac number, because 643604208199 - 2¹¹ = 643604206151 is a prime.

It is a super-2 number, since 2×643604208199² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643604208109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4209969 + ... + 4360165.

It is an arithmetic number, because the mean of its divisors is an integer number (41206821300).

Almost surely, 2^643604208199 is an apocalyptic number.

643604208199 is a deficient number, since it is larger than the sum of its proper divisors (15704932601).

643604208199 is a wasteful number, since it uses less digits than its factorization.

643604208199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150810.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 643604208199 in words is "six hundred forty-three billion, six hundred four million, two hundred eight thousand, one hundred ninety-nine".