165563205 has 16 divisors (see below), whose sum is σ = 265127040. Its totient is φ = 88225088.

The previous prime is 165563191. The next prime is 165563213. The reversal of 165563205 is 502365561.

It is a cyclic number.

It is not a de Polignac number, because 165563205 - 2⁵ = 165563173 is a prime.

It is a super-2 number, since 2×165563205² = 54822349699744050, which contains 22 as substring.

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, 16576 + ... + 24614.

It is an arithmetic number, because the mean of its divisors is an integer number (16570440).

Almost surely, 2^165563205 is an apocalyptic number.

165563205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165563205 is a deficient number, since it is larger than the sum of its proper divisors (99563835).

165563205 is a wasteful number, since it uses less digits than its factorization.

165563205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 165563205 is about 12867.1366278594. The cubic root of 165563205 is about 549.1040011861.

The spelling of 165563205 in words is "one hundred sixty-five million, five hundred sixty-three thousand, two hundred five".