643315168 has 12 divisors (see below), whose sum is σ = 1266526800. Its totient is φ = 321657568.

The previous prime is 643315159. The next prime is 643315177. The reversal of 643315168 is 861513346.

It is an interprime number because it is at equal distance from previous prime (643315159) and next prime (643315177).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051768 + ... + 10051831.

It is an arithmetic number, because the mean of its divisors is an integer number (105543900).

Almost surely, 2^643315168 is an apocalyptic number.

It is an amenable number.

643315168 is a deficient number, since it is larger than the sum of its proper divisors (623211632).

643315168 is a wasteful number, since it uses less digits than its factorization.

643315168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20103609 (or 20103601 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 643315168 is about 25363.6584111993. The cubic root of 643315168 is about 863.2592960200.

The spelling of 643315168 in words is "six hundred forty-three million, three hundred fifteen thousand, one hundred sixty-eight".