643466343 has 16 divisors (see below), whose sum is σ = 924736736. Its totient is φ = 395642880.

The previous prime is 643466333. The next prime is 643466357. The reversal of 643466343 is 343664346.

It is not a de Polignac number, because 643466343 - 2⁶ = 643466279 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643466323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44223 + ... + 56943.

It is an arithmetic number, because the mean of its divisors is an integer number (57796046).

Almost surely, 2^643466343 is an apocalyptic number.

643466343 is a deficient number, since it is larger than the sum of its proper divisors (281270393).

643466343 is a wasteful number, since it uses less digits than its factorization.

643466343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034.

The product of its digits is 373248, while the sum is 39.

The square root of 643466343 is about 25366.6383858800. The cubic root of 643466343 is about 863.3269108841.

The spelling of 643466343 in words is "six hundred forty-three million, four hundred sixty-six thousand, three hundred forty-three".