165417081 has 16 divisors (see below), whose sum is σ = 234493056. Its totient is φ = 103490816.

The previous prime is 165417067. The next prime is 165417103. The reversal of 165417081 is 180714561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165417081 - 2¹⁰ = 165416057 is a prime.

It is a super-2 number, since 2×165417081² = 54725621373121122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (165417011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18960 + ... + 26273.

It is an arithmetic number, because the mean of its divisors is an integer number (14655816).

Almost surely, 2^165417081 is an apocalyptic number.

It is an amenable number.

165417081 is a deficient number, since it is larger than the sum of its proper divisors (69075975).

165417081 is a wasteful number, since it uses less digits than its factorization.

165417081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45312.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 165417081 is about 12861.4571880483. The cubic root of 165417081 is about 548.9424095448.

The spelling of 165417081 in words is "one hundred sixty-five million, four hundred seventeen thousand, eighty-one".