165860917 has 2 divisors, whose sum is σ = 165860918. Its totient is φ = 165860916.

The previous prime is 165860909. The next prime is 165860921. The reversal of 165860917 is 719068561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140398801 + 25462116 = 11849^2 + 5046^2 .

It is a cyclic number.

It is not a de Polignac number, because 165860917 - 2³ = 165860909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165860927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82930458 + 82930459.

It is an arithmetic number, because the mean of its divisors is an integer number (82930459).

Almost surely, 2^165860917 is an apocalyptic number.

It is an amenable number.

165860917 is a deficient number, since it is larger than the sum of its proper divisors (1).

165860917 is an equidigital number, since it uses as much as digits as its factorization.

165860917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 165860917 is about 12878.7001285068. The cubic root of 165860917 is about 549.4329328925.

The spelling of 165860917 in words is "one hundred sixty-five million, eight hundred sixty thousand, nine hundred seventeen".