643527343 has 2 divisors, whose sum is σ = 643527344. Its totient is φ = 643527342.

The previous prime is 643527329. The next prime is 643527377. The reversal of 643527343 is 343725346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643527343 - 2⁹ = 643526831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643527383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321763671 + 321763672.

It is an arithmetic number, because the mean of its divisors is an integer number (321763672).

Almost surely, 2^643527343 is an apocalyptic number.

643527343 is a deficient number, since it is larger than the sum of its proper divisors (1).

643527343 is an equidigital number, since it uses as much as digits as its factorization.

643527343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 37.

The square root of 643527343 is about 25367.8407240348. The cubic root of 643527343 is about 863.3541908800.

The spelling of 643527343 in words is "six hundred forty-three million, five hundred twenty-seven thousand, three hundred forty-three".