643116605 has 8 divisors (see below), whose sum is σ = 771876864. Its totient is φ = 514402000.

The previous prime is 643116599. The next prime is 643116623. The reversal of 643116605 is 506611346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643116605 - 2¹⁴ = 643100221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44420 + ... + 57090.

It is an arithmetic number, because the mean of its divisors is an integer number (96484608).

Almost surely, 2^643116605 is an apocalyptic number.

It is an amenable number.

643116605 is a deficient number, since it is larger than the sum of its proper divisors (128760259).

643116605 is a wasteful number, since it uses less digits than its factorization.

643116605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22827.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 643116605 is about 25359.7437881379. The cubic root of 643116605 is about 863.1704701988.

The spelling of 643116605 in words is "six hundred forty-three million, one hundred sixteen thousand, six hundred five".