643712117 has 8 divisors (see below), whose sum is σ = 664914432. Its totient is φ = 622537200.

The previous prime is 643712093. The next prime is 643712119. The reversal of 643712117 is 711217346.

643712117 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 643712117 - 2¹⁶ = 643646581 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 (643712119) 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, 48008 + ... + 59934.

It is an arithmetic number, because the mean of its divisors is an integer number (83114304).

Almost surely, 2^643712117 is an apocalyptic number.

It is an amenable number.

643712117 is a deficient number, since it is larger than the sum of its proper divisors (21202315).

643712117 is a wasteful number, since it uses less digits than its factorization.

643712117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13699.

The product of its digits is 7056, while the sum is 32.

The square root of 643712117 is about 25371.4823571663. The cubic root of 643712117 is about 863.4368137053.

The spelling of 643712117 in words is "six hundred forty-three million, seven hundred twelve thousand, one hundred seventeen".