643370199 has 4 divisors (see below), whose sum is σ = 857826936. Its totient is φ = 428913464.

The previous prime is 643370183. The next prime is 643370207. The reversal of 643370199 is 991073346.

643370199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643370199 - 2⁴ = 643370183 is a prime.

It is a super-2 number, since 2×643370199² = 827850425922599202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643370199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643370129) 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, 107228364 + ... + 107228369.

It is an arithmetic number, because the mean of its divisors is an integer number (214456734).

Almost surely, 2^643370199 is an apocalyptic number.

643370199 is a deficient number, since it is larger than the sum of its proper divisors (214456737).

643370199 is a wasteful number, since it uses less digits than its factorization.

643370199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214456736.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 643370199 is about 25364.7432275590. The cubic root of 643370199 is about 863.2839105326.

The spelling of 643370199 in words is "six hundred forty-three million, three hundred seventy thousand, one hundred ninety-nine".