16606665 has 24 divisors (see below), whose sum is σ = 30301440. Its totient is φ = 8390304.

The previous prime is 16606661. The next prime is 16606693. The reversal of 16606665 is 56660661.

It is not a de Polignac number, because 16606665 - 2² = 16606661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16606661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8857 + ... + 10566.

It is an arithmetic number, because the mean of its divisors is an integer number (1262560).

Almost surely, 2^16606665 is an apocalyptic number.

16606665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16606665 is a deficient number, since it is larger than the sum of its proper divisors (13694775).

16606665 is a wasteful number, since it uses less digits than its factorization.

16606665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19453 (or 19450 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 16606665 is about 4075.1276053640. The cubic root of 16606665 is about 255.1295765906.

It can be divided in two parts, 16606 and 665, that added together give a palindrome (17271).

The spelling of 16606665 in words is "sixteen million, six hundred six thousand, six hundred sixty-five".