165818011 has 2 divisors, whose sum is σ = 165818012. Its totient is φ = 165818010.

The previous prime is 165817991. The next prime is 165818033. The reversal of 165818011 is 110818561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165818011 - 2¹¹ = 165815963 is a prime.

It is a super-2 number, since 2×165818011² = 54991225543992242, which contains 22 as substring.

It is equal to p_9282019 and since 165818011 and 9282019 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165818311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82909005 + 82909006.

It is an arithmetic number, because the mean of its divisors is an integer number (82909006).

Almost surely, 2^165818011 is an apocalyptic number.

165818011 is a deficient number, since it is larger than the sum of its proper divisors (1).

165818011 is an equidigital number, since it uses as much as digits as its factorization.

165818011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 31.

The square root of 165818011 is about 12877.0342470617. The cubic root of 165818011 is about 549.3855518239.

The spelling of 165818011 in words is "one hundred sixty-five million, eight hundred eighteen thousand, eleven".