165191085 has 48 divisors (see below), whose sum is σ = 293155200. Its totient is φ = 86029440.

The previous prime is 165191069. The next prime is 165191087. The reversal of 165191085 is 580191561.

It is not a de Polignac number, because 165191085 - 2⁴ = 165191069 is a prime.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165191087) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 475882 + ... + 476228.

It is an arithmetic number, because the mean of its divisors is an integer number (6107400).

Almost surely, 2^165191085 is an apocalyptic number.

165191085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165191085 is a deficient number, since it is larger than the sum of its proper divisors (127964115).

165191085 is a wasteful number, since it uses less digits than its factorization.

165191085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The square root of 165191085 is about 12852.6683999861. The cubic root of 165191085 is about 548.6923037151.

The spelling of 165191085 in words is "one hundred sixty-five million, one hundred ninety-one thousand, eighty-five".