643355299 has 2 divisors, whose sum is σ = 643355300. Its totient is φ = 643355298.

The previous prime is 643355267. The next prime is 643355303. The reversal of 643355299 is 992553346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643355299 - 2⁵ = 643355267 is a prime.

It is not a weakly prime, because it can be changed into another prime (643355099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321677649 + 321677650.

It is an arithmetic number, because the mean of its divisors is an integer number (321677650).

Almost surely, 2^643355299 is an apocalyptic number.

643355299 is a deficient number, since it is larger than the sum of its proper divisors (1).

643355299 is an equidigital number, since it uses as much as digits as its factorization.

643355299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 46.

The square root of 643355299 is about 25364.4495110775. The cubic root of 643355299 is about 863.2772461323.

The spelling of 643355299 in words is "six hundred forty-three million, three hundred fifty-five thousand, two hundred ninety-nine".