165416665 has 4 divisors (see below), whose sum is σ = 198500004. Its totient is φ = 132333328.

The previous prime is 165416663. The next prime is 165416683. The reversal of 165416665 is 566614561.

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 99920016 + 65496649 = 9996^2 + 8093^2 .

It is a cyclic number.

It is not a de Polignac number, because 165416665 - 2¹ = 165416663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165416663) 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, 16541662 + ... + 16541671.

It is an arithmetic number, because the mean of its divisors is an integer number (49625001).

Almost surely, 2^165416665 is an apocalyptic number.

It is an amenable number.

165416665 is a deficient number, since it is larger than the sum of its proper divisors (33083339).

165416665 is an equidigital number, since it uses as much as digits as its factorization.

165416665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33083338.

The product of its digits is 129600, while the sum is 40.

The square root of 165416665 is about 12861.4410156872. The cubic root of 165416665 is about 548.9419493742.

The spelling of 165416665 in words is "one hundred sixty-five million, four hundred sixteen thousand, six hundred sixty-five".