165740203 has 2 divisors, whose sum is σ = 165740204. Its totient is φ = 165740202.

The previous prime is 165740177. The next prime is 165740209. The reversal of 165740203 is 302047561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165740203 - 2⁵ = 165740171 is a prime.

It is not a weakly prime, because it can be changed into another prime (165740209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82870101 + 82870102.

It is an arithmetic number, because the mean of its divisors is an integer number (82870102).

Almost surely, 2^165740203 is an apocalyptic number.

165740203 is a deficient number, since it is larger than the sum of its proper divisors (1).

165740203 is an equidigital number, since it uses as much as digits as its factorization.

165740203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 165740203 is about 12874.0127000093. The cubic root of 165740203 is about 549.2996076441.

Adding to 165740203 its reverse (302047561), we get a palindrome (467787764).

The spelling of 165740203 in words is "one hundred sixty-five million, seven hundred forty thousand, two hundred three".