643421163 has 32 divisors (see below), whose sum is σ = 1070899200. Its totient is φ = 333833760.

The previous prime is 643421069. The next prime is 643421189. The reversal of 643421163 is 361124346.

It is not a de Polignac number, because 643421163 - 2⁸ = 643420907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643421163.

It is not an unprimeable number, because it can be changed into a prime (643421563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305488 + ... + 307586.

It is an arithmetic number, because the mean of its divisors is an integer number (33465600).

Almost surely, 2^643421163 is an apocalyptic number.

643421163 is a deficient number, since it is larger than the sum of its proper divisors (427478037).

643421163 is a wasteful number, since it uses less digits than its factorization.

643421163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447.

The product of its digits is 10368, while the sum is 30.

The square root of 643421163 is about 25365.7478304898. The cubic root of 643421163 is about 863.3067046873.

The spelling of 643421163 in words is "six hundred forty-three million, four hundred twenty-one thousand, one hundred sixty-three".