165040430281 has 2 divisors, whose sum is σ = 165040430282. Its totient is φ = 165040430280.

The previous prime is 165040430279. The next prime is 165040430287. The reversal of 165040430281 is 182034040561.

165040430281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164139229881 + 901200400 = 405141^2 + 30020^2 .

It is an emirp because it is prime and its reverse (182034040561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165040430281 - 2¹ = 165040430279 is a prime.

It is a super-2 number, since 2×165040430281² (a number of 23 digits) contains 22 as substring.

Together with 165040430279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165040430287) 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, 82520215140 + 82520215141.

It is an arithmetic number, because the mean of its divisors is an integer number (82520215141).

Almost surely, 2^165040430281 is an apocalyptic number.

It is an amenable number.

165040430281 is a deficient number, since it is larger than the sum of its proper divisors (1).

165040430281 is an equidigital number, since it uses as much as digits as its factorization.

165040430281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 165040430281 in words is "one hundred sixty-five billion, forty million, four hundred thirty thousand, two hundred eighty-one".