650005561 has 8 divisors (see below), whose sum is σ = 689141600. Its totient is φ = 611362080.

The previous prime is 650005541. The next prime is 650005579. The reversal of 650005561 is 165500056.

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

It is a cyclic number.

It is not a de Polignac number, because 650005561 - 2⁹ = 650005049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650005511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120420 + ... + 125701.

It is an arithmetic number, because the mean of its divisors is an integer number (86142700).

Almost surely, 2^650005561 is an apocalyptic number.

It is an amenable number.

650005561 is a deficient number, since it is larger than the sum of its proper divisors (39136039).

650005561 is a wasteful number, since it uses less digits than its factorization.

650005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246279.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 650005561 is about 25495.2066279134. The cubic root of 650005561 is about 866.2415756701.

The spelling of 650005561 in words is "six hundred fifty million, five thousand, five hundred sixty-one".