16650 has 36 divisors (see below), whose sum is σ = 45942. Its totient is φ = 4320.

The previous prime is 16649. The next prime is 16651. The reversal of 16650 is 5661.

16650 is a `hidden beast` number, since 1 + 665 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (16649) and next prime (16651).

It can be written as a sum of positive squares in 3 ways, for example, as 15129 + 1521 = 123^2 + 39^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (16651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 432 + ... + 468.

2¹⁶⁶⁵⁰ is an apocalyptic number.

16650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22971).

16650 is an abundant number, since it is smaller than the sum of its proper divisors (29292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16650 is a wasteful number, since it uses less digits than its factorization.

16650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 16650 is about 129.0348790056. The cubic root of 16650 is about 25.5351303574.

It can be divided in two parts, 166 and 50, that added together give a cube (216 = 6³).

The spelling of 16650 in words is "sixteen thousand, six hundred fifty".