165669869 has 2 divisors, whose sum is σ = 165669870. Its totient is φ = 165669868.

The previous prime is 165669827. The next prime is 165669871. The reversal of 165669869 is 968966561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164814244 + 855625 = 12838^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 165669869 - 2¹⁶ = 165604333 is a prime.

It is a super-3 number, since 3×165669869³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 165669871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165662869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82834934 + 82834935.

It is an arithmetic number, because the mean of its divisors is an integer number (82834935).

Almost surely, 2^165669869 is an apocalyptic number.

It is an amenable number.

165669869 is a deficient number, since it is larger than the sum of its proper divisors (1).

165669869 is an equidigital number, since it uses as much as digits as its factorization.

165669869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 56.

The square root of 165669869 is about 12871.2807832010. The cubic root of 165669869 is about 549.2218958513.

The spelling of 165669869 in words is "one hundred sixty-five million, six hundred sixty-nine thousand, eight hundred sixty-nine".