165440161330231 has 2 divisors, whose sum is σ = 165440161330232. Its totient is φ = 165440161330230.

The previous prime is 165440161330189. The next prime is 165440161330289. The reversal of 165440161330231 is 132033161044561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165440161330231 - 2²⁵ = 165440127775799 is a prime.

It is a super-2 number, since 2×165440161330231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165440161330331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82720080665115 + 82720080665116.

It is an arithmetic number, because the mean of its divisors is an integer number (82720080665116).

Almost surely, 2^{165440161330231} is an apocalyptic number.

165440161330231 is a deficient number, since it is larger than the sum of its proper divisors (1).

165440161330231 is an equidigital number, since it uses as much as digits as its factorization.

165440161330231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 165440161330231 in words is "one hundred sixty-five trillion, four hundred forty billion, one hundred sixty-one million, three hundred thirty thousand, two hundred thirty-one".