165490305 has 16 divisors (see below), whose sum is σ = 264986304. Its totient is φ = 88194240.

The previous prime is 165490301. The next prime is 165490331. The reversal of 165490305 is 503094561.

It is a happy number.

165490305 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 165490305 - 2² = 165490301 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165490301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21015 + ... + 27795.

It is an arithmetic number, because the mean of its divisors is an integer number (16561644).

Almost surely, 2^165490305 is an apocalyptic number.

165490305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165490305 is a deficient number, since it is larger than the sum of its proper divisors (99495999).

165490305 is a wasteful number, since it uses less digits than its factorization.

165490305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8416.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 165490305 is about 12864.3035178746. The cubic root of 165490305 is about 549.0233964037.

The spelling of 165490305 in words is "one hundred sixty-five million, four hundred ninety thousand, three hundred five".