165018361 has 2 divisors, whose sum is σ = 165018362. Its totient is φ = 165018360.

The previous prime is 165018349. The next prime is 165018377. The reversal of 165018361 is 163810561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164994025 + 24336 = 12845^2 + 156^2 .

It is a cyclic number.

It is not a de Polignac number, because 165018361 - 2⁷ = 165018233 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (165018341) 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 as a sum of consecutive naturals, namely, 82509180 + 82509181.

It is an arithmetic number, because the mean of its divisors is an integer number (82509181).

Almost surely, 2^165018361 is an apocalyptic number.

It is an amenable number.

165018361 is a deficient number, since it is larger than the sum of its proper divisors (1).

165018361 is an equidigital number, since it uses as much as digits as its factorization.

165018361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 165018361 is about 12845.9472597392. The cubic root of 165018361 is about 548.5009992428.

The spelling of 165018361 in words is "one hundred sixty-five million, eighteen thousand, three hundred sixty-one".