16666165 has 4 divisors (see below), whose sum is σ = 19999404. Its totient is φ = 13332928.

The previous prime is 16666163. The next prime is 16666201. The reversal of 16666165 is 56166661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8814961 + 7851204 = 2969^2 + 2802^2 .

It is a cyclic number.

It is not a de Polignac number, because 16666165 - 2¹ = 16666163 is a prime.

It is a super-2 number, since 2×16666165² = 555522111614450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666612 + ... + 1666621.

It is an arithmetic number, because the mean of its divisors is an integer number (4999851).

Almost surely, 2^16666165 is an apocalyptic number.

It is an amenable number.

16666165 is a deficient number, since it is larger than the sum of its proper divisors (3333239).

16666165 is an equidigital number, since it uses as much as digits as its factorization.

16666165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333238.

The product of its digits is 38880, while the sum is 37.

The square root of 16666165 is about 4082.4214628086. The cubic root of 16666165 is about 255.4339145595.

The spelling of 16666165 in words is "sixteen million, six hundred sixty-six thousand, one hundred sixty-five".