643452266 has 8 divisors (see below), whose sum is σ = 966370944. Its totient is φ = 321328620.

The previous prime is 643452259. The next prime is 643452281. The reversal of 643452266 is 662254346.

643452266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196730 + ... + 199973.

It is an arithmetic number, because the mean of its divisors is an integer number (120796368).

Almost surely, 2^643452266 is an apocalyptic number.

643452266 is a deficient number, since it is larger than the sum of its proper divisors (322918678).

643452266 is a wasteful number, since it uses less digits than its factorization.

643452266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397516.

The product of its digits is 207360, while the sum is 38.

The square root of 643452266 is about 25366.3609136194. The cubic root of 643452266 is about 863.3206152212.

The spelling of 643452266 in words is "six hundred forty-three million, four hundred fifty-two thousand, two hundred sixty-six".