643254163 has 8 divisors (see below), whose sum is σ = 656894448. Its totient is φ = 629669664.

The previous prime is 643254149. The next prime is 643254187. The reversal of 643254163 is 361452346.

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 643254163 - 2⁹ = 643253651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643254113) 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, 9781 + ... + 37177.

It is an arithmetic number, because the mean of its divisors is an integer number (82111806).

Almost surely, 2^643254163 is an apocalyptic number.

643254163 is a deficient number, since it is larger than the sum of its proper divisors (13640285).

643254163 is a wasteful number, since it uses less digits than its factorization.

643254163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27893.

The product of its digits is 51840, while the sum is 34.

The square root of 643254163 is about 25362.4557762059. The cubic root of 643254163 is about 863.2320077894.

The spelling of 643254163 in words is "six hundred forty-three million, two hundred fifty-four thousand, one hundred sixty-three".