165190805 has 16 divisors (see below), whose sum is σ = 215169024. Its totient is φ = 121020480.

The previous prime is 165190793. The next prime is 165190813. The reversal of 165190805 is 508091561.

165190805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165190805 - 2⁴ = 165190789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751 + ... + 18260.

It is an arithmetic number, because the mean of its divisors is an integer number (13448064).

Almost surely, 2^165190805 is an apocalyptic number.

It is an amenable number.

165190805 is a deficient number, since it is larger than the sum of its proper divisors (49978219).

165190805 is a wasteful number, since it uses less digits than its factorization.

165190805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 165190805 is about 12852.6575073017. The cubic root of 165190805 is about 548.6919937025.

The spelling of 165190805 in words is "one hundred sixty-five million, one hundred ninety thousand, eight hundred five".