650640161 has 8 divisors (see below), whose sum is σ = 685682880. Its totient is φ = 615677328.

The previous prime is 650640139. The next prime is 650640173. The reversal of 650640161 is 161046056.

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 650640161 - 2⁶ = 650640097 is a prime.

It is a super-2 number, since 2×650640161² = 846665238212211842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650640131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 36186.

It is an arithmetic number, because the mean of its divisors is an integer number (85710360).

Almost surely, 2^650640161 is an apocalyptic number.

It is an amenable number.

650640161 is a deficient number, since it is larger than the sum of its proper divisors (35042719).

650640161 is a wasteful number, since it uses less digits than its factorization.

650640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39943.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 650640161 is about 25507.6490684657. The cubic root of 650640161 is about 866.5233876718.

The spelling of 650640161 in words is "six hundred fifty million, six hundred forty thousand, one hundred sixty-one".