643505116303 has 4 divisors (see below), whose sum is σ = 735434418640. Its totient is φ = 551575813968.

The previous prime is 643505116279. The next prime is 643505116307. The reversal of 643505116303 is 303611505346.

It is a happy number.

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 643505116303 - 2¹³ = 643505108111 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 (643505116307) 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, 45964651158 + ... + 45964651171.

It is an arithmetic number, because the mean of its divisors is an integer number (183858604660).

Almost surely, 2^643505116303 is an apocalyptic number.

643505116303 is a deficient number, since it is larger than the sum of its proper divisors (91929302337).

643505116303 is an equidigital number, since it uses as much as digits as its factorization.

643505116303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91929302336.

The product of its (nonzero) digits is 97200, while the sum is 37.

The spelling of 643505116303 in words is "six hundred forty-three billion, five hundred five million, one hundred sixteen thousand, three hundred three".