650405561 has 8 divisors (see below), whose sum is σ = 704068680. Its totient is φ = 597261312.

The previous prime is 650405543. The next prime is 650405563. The reversal of 650405561 is 165504056.

650405561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 52113961 + 598291600 = 7219^2 + 24460^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650405561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650405563) 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, 127106 + ... + 132123.

It is an arithmetic number, because the mean of its divisors is an integer number (88008585).

Almost surely, 2^650405561 is an apocalyptic number.

It is an amenable number.

650405561 is a deficient number, since it is larger than the sum of its proper divisors (53663119).

650405561 is a wasteful number, since it uses less digits than its factorization.

650405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259435.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 650405561 is about 25503.0500332803. The cubic root of 650405561 is about 866.4192282933.

The spelling of 650405561 in words is "six hundred fifty million, four hundred five thousand, five hundred sixty-one".