643198105 has 64 divisors (see below), whose sum is σ = 923788800. Its totient is φ = 424990720.

The previous prime is 643198103. The next prime is 643198133. The reversal of 643198105 is 501891346.

643198105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643198105 - 2¹ = 643198103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643198103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3264867 + ... + 3265063.

It is an arithmetic number, because the mean of its divisors is an integer number (14434200).

Almost surely, 2^643198105 is an apocalyptic number.

It is an amenable number.

643198105 is a deficient number, since it is larger than the sum of its proper divisors (280590695).

643198105 is a wasteful number, since it uses less digits than its factorization.

643198105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 643198105 is about 25361.3506146656. The cubic root of 643198105 is about 863.2069308869.

The spelling of 643198105 in words is "six hundred forty-three million, one hundred ninety-eight thousand, one hundred five".