163818365 has 4 divisors (see below), whose sum is σ = 196582044. Its totient is φ = 131054688.

The previous prime is 163818349. The next prime is 163818373. The reversal of 163818365 is 563818361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563818361 = 409 ⋅1378529.

It can be written as a sum of positive squares in 2 ways, for example, as 50310649 + 113507716 = 7093^2 + 10654^2 .

It is a cyclic number.

It is not a de Polignac number, because 163818365 - 2⁴ = 163818349 is a prime.

It is a super-3 number, since 3×163818365³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16381832 + ... + 16381841.

It is an arithmetic number, because the mean of its divisors is an integer number (49145511).

Almost surely, 2^163818365 is an apocalyptic number.

It is an amenable number.

163818365 is a deficient number, since it is larger than the sum of its proper divisors (32763679).

163818365 is an equidigital number, since it uses as much as digits as its factorization.

163818365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32763678.

The product of its digits is 103680, while the sum is 41.

The square root of 163818365 is about 12799.1548549113. The cubic root of 163818365 is about 547.1682163753.

The spelling of 163818365 in words is "one hundred sixty-three million, eight hundred eighteen thousand, three hundred sixty-five".