165216966169 has 4 divisors (see below), whose sum is σ = 166139966160. Its totient is φ = 164293966180.

The previous prime is 165216966163. The next prime is 165216966179. The reversal of 165216966169 is 961669612561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 961669612561 = 7 ⋅137381373223.

It is a cyclic number.

It is not a de Polignac number, because 165216966169 - 2⁵ = 165216966137 is a prime.

It is a super-2 number, since 2×165216966169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165216966163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461499727 + ... + 461500084.

It is an arithmetic number, because the mean of its divisors is an integer number (41534991540).

Almost surely, 2^165216966169 is an apocalyptic number.

It is an amenable number.

165216966169 is a deficient number, since it is larger than the sum of its proper divisors (922999991).

165216966169 is an equidigital number, since it uses as much as digits as its factorization.

165216966169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922999990.

The product of its digits is 6298560, while the sum is 58.

The spelling of 165216966169 in words is "one hundred sixty-five billion, two hundred sixteen million, nine hundred sixty-six thousand, one hundred sixty-nine".