165417505 has 16 divisors (see below), whose sum is σ = 220636224. Its totient is φ = 118031680.

The previous prime is 165417407. The next prime is 165417509. The reversal of 165417505 is 505714561.

It is a de Polignac number, because none of the positive numbers 2^k-165417505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165417509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25459 + ... + 31288.

It is an arithmetic number, because the mean of its divisors is an integer number (13789764).

Almost surely, 2^165417505 is an apocalyptic number.

It is an amenable number.

165417505 is a deficient number, since it is larger than the sum of its proper divisors (55218719).

165417505 is a wasteful number, since it uses less digits than its factorization.

165417505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56816.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 165417505 is about 12861.4736713955. The cubic root of 165417505 is about 548.9428785641.

The spelling of 165417505 in words is "one hundred sixty-five million, four hundred seventeen thousand, five hundred five".