165555 has 24 divisors (see below), whose sum is σ = 310128. Its totient is φ = 81216.

The previous prime is 165553. The next prime is 165559. The reversal of 165555 is 555561.

165555 is a `hidden beast` number, since 1 + 655 + 5 + 5 = 666.

165555 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 165555 - 2¹ = 165553 is a prime.

165555 is a modest number, since divided by 555 gives 165 as remainder.

It is not an unprimeable number, because it can be changed into a prime (165551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444 + ... + 726.

It is an arithmetic number, because the mean of its divisors is an integer number (12922).

2¹⁶⁵⁵⁵⁵ is an apocalyptic number.

165555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165555 is a deficient number, since it is larger than the sum of its proper divisors (144573).

165555 is a wasteful number, since it uses less digits than its factorization.

165555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 304 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 165555 is about 406.8845044973. The cubic root of 165555 is about 54.9094930184.

It can be divided in two parts, 1 and 65555, that added together give a palindrome (65556).

The spelling of 165555 in words is "one hundred sixty-five thousand, five hundred fifty-five".