165664123481 has 2 divisors, whose sum is σ = 165664123482. Its totient is φ = 165664123480.

The previous prime is 165664123447. The next prime is 165664123519. The reversal of 165664123481 is 184321466561.

165664123481 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., 160713593881 + 4950529600 = 400891^2 + 70360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165664123481 is a prime.

It is a super-2 number, since 2×165664123481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165664123421) 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, 82832061740 + 82832061741.

It is an arithmetic number, because the mean of its divisors is an integer number (82832061741).

Almost surely, 2^165664123481 is an apocalyptic number.

It is an amenable number.

165664123481 is a deficient number, since it is larger than the sum of its proper divisors (1).

165664123481 is an equidigital number, since it uses as much as digits as its factorization.

165664123481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 47.

The spelling of 165664123481 in words is "one hundred sixty-five billion, six hundred sixty-four million, one hundred twenty-three thousand, four hundred eighty-one".