643513305499 has 2 divisors, whose sum is σ = 643513305500. Its totient is φ = 643513305498.

The previous prime is 643513305439. The next prime is 643513305521. The reversal of 643513305499 is 994503315346.

643513305499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643513305499 - 2²³ = 643504916891 is a prime.

It is not a weakly prime, because it can be changed into another prime (643513305419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321756652749 + 321756652750.

It is an arithmetic number, because the mean of its divisors is an integer number (321756652750).

Almost surely, 2^643513305499 is an apocalyptic number.

643513305499 is a deficient number, since it is larger than the sum of its proper divisors (1).

643513305499 is an equidigital number, since it uses as much as digits as its factorization.

643513305499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5248800, while the sum is 52.

The spelling of 643513305499 in words is "six hundred forty-three billion, five hundred thirteen million, three hundred five thousand, four hundred ninety-nine".