165941873231 has 2 divisors, whose sum is σ = 165941873232. Its totient is φ = 165941873230.

The previous prime is 165941873189. The next prime is 165941873249. The reversal of 165941873231 is 132378149561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165941873231 is a prime.

It is a super-2 number, since 2×165941873231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165941873231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165941873281) 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, 82970936615 + 82970936616.

It is an arithmetic number, because the mean of its divisors is an integer number (82970936616).

Almost surely, 2^165941873231 is an apocalyptic number.

165941873231 is a deficient number, since it is larger than the sum of its proper divisors (1).

165941873231 is an equidigital number, since it uses as much as digits as its factorization.

165941873231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The spelling of 165941873231 in words is "one hundred sixty-five billion, nine hundred forty-one million, eight hundred seventy-three thousand, two hundred thirty-one".