650661 has 8 divisors (see below), whose sum is σ = 946464. Its totient is φ = 394320.

The previous prime is 650627. The next prime is 650669. The reversal of 650661 is 166056.

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

It is a de Polignac number, because none of the positive numbers 2^k-650661 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650669) 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, 9826 + ... + 9891.

It is an arithmetic number, because the mean of its divisors is an integer number (118308).

2⁶⁵⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

650661 is a deficient number, since it is larger than the sum of its proper divisors (295803).

650661 is a wasteful number, since it uses less digits than its factorization.

650661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19731.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 650661 is about 806.6356054626. The cubic root of 650661 is about 86.6532638709.

The spelling of 650661 in words is "six hundred fifty thousand, six hundred sixty-one".