643163316 has 12 divisors (see below), whose sum is σ = 1500714432. Its totient is φ = 214387768.

The previous prime is 643163299. The next prime is 643163333. The reversal of 643163316 is 613361346.

643163316 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643163299) and next prime (643163333).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26798460 + ... + 26798483.

It is an arithmetic number, because the mean of its divisors is an integer number (125059536).

Almost surely, 2^643163316 is an apocalyptic number.

It is an amenable number.

643163316 is an abundant number, since it is smaller than the sum of its proper divisors (857551116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643163316 is a wasteful number, since it uses less digits than its factorization.

643163316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53596950 (or 53596948 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 643163316 is about 25360.6647389220. The cubic root of 643163316 is about 863.1913676946.

The spelling of 643163316 in words is "six hundred forty-three million, one hundred sixty-three thousand, three hundred sixteen".