165868061 has 2 divisors, whose sum is σ = 165868062. Its totient is φ = 165868060.

The previous prime is 165868039. The next prime is 165868091. The reversal of 165868061 is 160868561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136165561 + 29702500 = 11669^2 + 5450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165868061 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165868091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82934030 + 82934031.

It is an arithmetic number, because the mean of its divisors is an integer number (82934031).

Almost surely, 2^165868061 is an apocalyptic number.

It is an amenable number.

165868061 is a deficient number, since it is larger than the sum of its proper divisors (1).

165868061 is an equidigital number, since it uses as much as digits as its factorization.

165868061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 165868061 is about 12878.9774827041. The cubic root of 165868061 is about 549.4408212136.

The spelling of 165868061 in words is "one hundred sixty-five million, eight hundred sixty-eight thousand, sixty-one".