650643666 has 8 divisors (see below), whose sum is σ = 1301287344. Its totient is φ = 216881220.

The previous prime is 650643659. The next prime is 650643683. The reversal of 650643666 is 666346056.

It is a happy number.

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

650643666 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54220300 + ... + 54220311.

It is an arithmetic number, because the mean of its divisors is an integer number (162660918).

Almost surely, 2^650643666 is an apocalyptic number.

650643666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

650643666 is a wasteful number, since it uses less digits than its factorization.

650643666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108440616.

The product of its (nonzero) digits is 466560, while the sum is 42.

The square root of 650643666 is about 25507.7177732544. The cubic root of 650643666 is about 866.5249436568.

The spelling of 650643666 in words is "six hundred fifty million, six hundred forty-three thousand, six hundred sixty-six".