165334194561 has 16 divisors (see below), whose sum is σ = 220759568640. Its totient is φ = 110065898880.

The previous prime is 165334194559. The next prime is 165334194581. The reversal of 165334194561 is 165491433561.

It is not a de Polignac number, because 165334194561 - 2¹ = 165334194559 is a prime.

It is a super-2 number, since 2×165334194561² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165334194561.

It is not an unprimeable number, because it can be changed into a prime (165334194511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8907951 + ... + 8926491.

It is an arithmetic number, because the mean of its divisors is an integer number (13797473040).

Almost surely, 2^165334194561 is an apocalyptic number.

It is an amenable number.

165334194561 is a deficient number, since it is larger than the sum of its proper divisors (55425374079).

165334194561 is a wasteful number, since it uses less digits than its factorization.

165334194561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22616.

The product of its digits is 1166400, while the sum is 48.

The spelling of 165334194561 in words is "one hundred sixty-five billion, three hundred thirty-four million, one hundred ninety-four thousand, five hundred sixty-one".