643256662 has 8 divisors (see below), whose sum is σ = 964992600. Its totient is φ = 321592464.

The previous prime is 643256639. The next prime is 643256689. The reversal of 643256662 is 266652346.

643256662 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 a congruent number.

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, 26889 + ... + 44827.

It is an arithmetic number, because the mean of its divisors is an integer number (120624075).

Almost surely, 2^643256662 is an apocalyptic number.

643256662 is a deficient number, since it is larger than the sum of its proper divisors (321735938).

643256662 is a wasteful number, since it uses less digits than its factorization.

643256662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35870.

The product of its digits is 311040, while the sum is 40.

The square root of 643256662 is about 25362.5050418921. The cubic root of 643256662 is about 863.2331256544.

The spelling of 643256662 in words is "six hundred forty-three million, two hundred fifty-six thousand, six hundred sixty-two".