163855 has 4 divisors (see below), whose sum is σ = 196632. Its totient is φ = 131080.

The previous prime is 163853. The next prime is 163859. The reversal of 163855 is 558361.

163855 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558361 = 647 ⋅863.

It is not a de Polignac number, because 163855 - 2¹ = 163853 is a prime.

It is a super-2 number, since 2×163855² = 53696922050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16381 + ... + 16390.

It is an arithmetic number, because the mean of its divisors is an integer number (49158).

163855 is a Friedman number, since it can be written as 5*(8^5+6-3*1), using all its digits and the basic arithmetic operations.

2¹⁶³⁸⁵⁵ is an apocalyptic number.

163855 is a deficient number, since it is larger than the sum of its proper divisors (32777).

163855 is an equidigital number, since it uses as much as digits as its factorization.

163855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32776.

The product of its digits is 3600, while the sum is 28.

The square root of 163855 is about 404.7900690481. The cubic root of 163855 is about 54.7209001411.

The spelling of 163855 in words is "one hundred sixty-three thousand, eight hundred fifty-five".