643444103 has 8 divisors (see below), whose sum is σ = 657653760. Its totient is φ = 629377560.

The previous prime is 643444073. The next prime is 643444111. The reversal of 643444103 is 301444346.

643444103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643444103 - 2⁸ = 643443847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643444183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26663 + ... + 44696.

It is an arithmetic number, because the mean of its divisors is an integer number (82206720).

Almost surely, 2^643444103 is an apocalyptic number.

643444103 is a deficient number, since it is larger than the sum of its proper divisors (14209657).

643444103 is a wasteful number, since it uses less digits than its factorization.

643444103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71557.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 643444103 is about 25366.2000110383. The cubic root of 643444103 is about 863.3169644371.

Adding to 643444103 its reverse (301444346), we get a palindrome (944888449).

The spelling of 643444103 in words is "six hundred forty-three million, four hundred forty-four thousand, one hundred three".