16650005 has 8 divisors (see below), whose sum is σ = 20115000. Its totient is φ = 13230016.

The previous prime is 16650001. The next prime is 16650041. The reversal of 16650005 is 50005661.

It can be written as a sum of positive squares in 4 ways, for example, as 117649 + 16532356 = 343^2 + 4066^2 .

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 16650005 - 2² = 16650001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16650001) 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, 10430 + ... + 11919.

It is an arithmetic number, because the mean of its divisors is an integer number (2514375).

Almost surely, 2^16650005 is an apocalyptic number.

It is an amenable number.

16650005 is a deficient number, since it is larger than the sum of its proper divisors (3464995).

16650005 is a wasteful number, since it uses less digits than its factorization.

16650005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22503.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 16650005 is about 4080.4417652994. The cubic root of 16650005 is about 255.3513291351.

Adding to 16650005 its reverse (50005661), we get a palindrome (66655666).

The spelling of 16650005 in words is "sixteen million, six hundred fifty thousand, five".