643303223 has 2 divisors, whose sum is σ = 643303224. Its totient is φ = 643303222.

The previous prime is 643303217. The next prime is 643303249. The reversal of 643303223 is 322303346.

It is an a-pointer prime, because the next prime (643303249) can be obtained adding 643303223 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643303223 - 2⁴ = 643303207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643303192 and 643303201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643300223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321651611 + 321651612.

It is an arithmetic number, because the mean of its divisors is an integer number (321651612).

Almost surely, 2^643303223 is an apocalyptic number.

643303223 is a deficient number, since it is larger than the sum of its proper divisors (1).

643303223 is an equidigital number, since it uses as much as digits as its factorization.

643303223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 26.

The square root of 643303223 is about 25363.4229354005. The cubic root of 643303223 is about 863.2539530214.

Adding to 643303223 its reverse (322303346), we get a palindrome (965606569).

The spelling of 643303223 in words is "six hundred forty-three million, three hundred three thousand, two hundred twenty-three".