165856090 has 8 divisors (see below), whose sum is σ = 298540980. Its totient is φ = 66342432.

The previous prime is 165856081. The next prime is 165856121. The reversal of 165856090 is 90658561.

165856090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 156425049 + 9431041 = 12507^2 + 3071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8292795 + ... + 8292814.

Almost surely, 2^165856090 is an apocalyptic number.

165856090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165856090 is a deficient number, since it is larger than the sum of its proper divisors (132684890).

165856090 is a wasteful number, since it uses less digits than its factorization.

165856090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16585616.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 165856090 is about 12878.5127246899. The cubic root of 165856090 is about 549.4276028474.

The spelling of 165856090 in words is "one hundred sixty-five million, eight hundred fifty-six thousand, ninety".