163565533 has 4 divisors (see below), whose sum is σ = 164759580. Its totient is φ = 162371488.

The previous prime is 163565513. The next prime is 163565543. The reversal of 163565533 is 335565361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335565361 = 41 ⋅8184521.

It can be written as a sum of positive squares in 2 ways, for example, as 74960964 + 88604569 = 8658^2 + 9413^2 .

It is a cyclic number.

It is not a de Polignac number, because 163565533 - 2¹⁷ = 163434461 is a prime.

It is a super-3 number, since 3×163565533³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163565492 and 163565501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163565513) 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, 596818 + ... + 597091.

It is an arithmetic number, because the mean of its divisors is an integer number (41189895).

Almost surely, 2^163565533 is an apocalyptic number.

It is an amenable number.

163565533 is a deficient number, since it is larger than the sum of its proper divisors (1194047).

163565533 is a wasteful number, since it uses less digits than its factorization.

163565533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194046.

The product of its digits is 121500, while the sum is 37.

The square root of 163565533 is about 12789.2741389025. The cubic root of 163565533 is about 546.8865774877.

The spelling of 163565533 in words is "one hundred sixty-three million, five hundred sixty-five thousand, five hundred thirty-three".