643363023 has 4 divisors (see below), whose sum is σ = 857817368. Its totient is φ = 428908680.

The previous prime is 643363013. The next prime is 643363027. The reversal of 643363023 is 320363346.

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

It is not a de Polignac number, because 643363023 - 2¹⁷ = 643231951 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 (643363027) 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, 107227168 + ... + 107227173.

It is an arithmetic number, because the mean of its divisors is an integer number (214454342).

Almost surely, 2^643363023 is an apocalyptic number.

643363023 is a deficient number, since it is larger than the sum of its proper divisors (214454345).

643363023 is a wasteful number, since it uses less digits than its factorization.

643363023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214454344.

The product of its (nonzero) digits is 23328, while the sum is 30.

The square root of 643363023 is about 25364.6017709721. The cubic root of 643363023 is about 863.2807008987.

The spelling of 643363023 in words is "six hundred forty-three million, three hundred sixty-three thousand, twenty-three".