650666661 has 8 divisors (see below), whose sum is σ = 867829920. Its totient is φ = 433640592.

The previous prime is 650666641. The next prime is 650666663. The reversal of 650666661 is 166666056.

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

It is not a de Polignac number, because 650666661 - 2¹⁴ = 650650277 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650666663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22666 + ... + 42603.

It is an arithmetic number, because the mean of its divisors is an integer number (108478740).

Almost surely, 2^650666661 is an apocalyptic number.

It is an amenable number.

650666661 is a deficient number, since it is larger than the sum of its proper divisors (217163259).

650666661 is a wasteful number, since it uses less digits than its factorization.

650666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68595.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 650666661 is about 25508.1685152031. The cubic root of 650666661 is about 866.5351517566.

The spelling of 650666661 in words is "six hundred fifty million, six hundred sixty-six thousand, six hundred sixty-one".