165111661017 has 24 divisors (see below), whose sum is σ = 239136468480. Its totient is φ = 109778535360.

The previous prime is 165111661007. The next prime is 165111661019. The reversal of 165111661017 is 710166111561.

It is a happy number.

165111661017 is a `hidden beast` number, since 1 + 6 + 5 + 11 + 16 + 610 + 17 = 666.

It is not a de Polignac number, because 165111661017 - 2¹² = 165111656921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165111661019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6396984 + ... + 6422742.

It is an arithmetic number, because the mean of its divisors is an integer number (9964019520).

Almost surely, 2^165111661017 is an apocalyptic number.

It is an amenable number.

165111661017 is a deficient number, since it is larger than the sum of its proper divisors (74024807463).

165111661017 is a wasteful number, since it uses less digits than its factorization.

165111661017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27653 (or 27650 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 36.

Adding to 165111661017 its reverse (710166111561), we get a palindrome (875277772578).

The spelling of 165111661017 in words is "one hundred sixty-five billion, one hundred eleven million, six hundred sixty-one thousand, seventeen".