165670313 has 4 divisors (see below), whose sum is σ = 166139988. Its totient is φ = 165200640.

The previous prime is 165670283. The next prime is 165670319. The reversal of 165670313 is 313076561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313076561 = 7 ⋅44725223.

It can be written as a sum of positive squares in 2 ways, for example, as 95981209 + 69689104 = 9797^2 + 8348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165670313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165670313.

It is not an unprimeable number, because it can be changed into a prime (165670319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234308 + ... + 235013.

It is an arithmetic number, because the mean of its divisors is an integer number (41534997).

Almost surely, 2^165670313 is an apocalyptic number.

It is an amenable number.

165670313 is a deficient number, since it is larger than the sum of its proper divisors (469675).

165670313 is an equidigital number, since it uses as much as digits as its factorization.

165670313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469674.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 165670313 is about 12871.2980308903. The cubic root of 165670313 is about 549.2223864944. Note that the first 3 decimals are identical.

The spelling of 165670313 in words is "one hundred sixty-five million, six hundred seventy thousand, three hundred thirteen".