643345363 has 4 divisors (see below), whose sum is σ = 643919368. Its totient is φ = 642771360.

The previous prime is 643345361. The next prime is 643345393. The reversal of 643345363 is 363543346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643345363 - 2¹ = 643345361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643345361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285318 + ... + 287563.

It is an arithmetic number, because the mean of its divisors is an integer number (160979842).

Almost surely, 2^643345363 is an apocalyptic number.

643345363 is a deficient number, since it is larger than the sum of its proper divisors (574005).

643345363 is a wasteful number, since it uses less digits than its factorization.

643345363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574004.

The product of its digits is 233280, while the sum is 37.

The square root of 643345363 is about 25364.2536456329. The cubic root of 643345363 is about 863.2728019489.

The spelling of 643345363 in words is "six hundred forty-three million, three hundred forty-five thousand, three hundred sixty-three".