163565855 has 4 divisors (see below), whose sum is σ = 196279032. Its totient is φ = 130852680.

The previous prime is 163565839. The next prime is 163565869. The reversal of 163565855 is 558565361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558565361 = 1039 ⋅537599.

It is not a de Polignac number, because 163565855 - 2⁴ = 163565839 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 16356581 + ... + 16356590.

It is an arithmetic number, because the mean of its divisors is an integer number (49069758).

Almost surely, 2^163565855 is an apocalyptic number.

163565855 is a deficient number, since it is larger than the sum of its proper divisors (32713177).

163565855 is an equidigital number, since it uses as much as digits as its factorization.

163565855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32713176.

The product of its digits is 540000, while the sum is 44.

The square root of 163565855 is about 12789.2867275701. The cubic root of 163565855 is about 546.8869363599.

The spelling of 163565855 in words is "one hundred sixty-three million, five hundred sixty-five thousand, eight hundred fifty-five".