16605665 has 8 divisors (see below), whose sum is σ = 19951488. Its totient is φ = 13268080.

The previous prime is 16605653. The next prime is 16605679. The reversal of 16605665 is 56650661.

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

It is not a de Polignac number, because 16605665 - 2¹⁴ = 16589281 is a prime.

It is a super-2 number, since 2×16605665² = 551496220184450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (2493936).

Almost surely, 2^16605665 is an apocalyptic number.

It is an amenable number.

16605665 is a deficient number, since it is larger than the sum of its proper divisors (3345823).

16605665 is a wasteful number, since it uses less digits than its factorization.

16605665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 16605665 is about 4075.0049079725. The cubic root of 16605665 is about 255.1244554600.

The spelling of 16605665 in words is "sixteen million, six hundred five thousand, six hundred sixty-five".