163533861 has 6 divisors (see below), whose sum is σ = 236215590. Its totient is φ = 109022568.

The previous prime is 163533827. The next prime is 163533889. The reversal of 163533861 is 168335361.

It is a happy number.

163533861 is a `hidden beast` number, since 1 + 63 + 533 + 8 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 85211361 + 78322500 = 9231^2 + 8850^2 .

It is not a de Polignac number, because 163533861 - 2¹¹ = 163531813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163533961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9085206 + ... + 9085223.

It is an arithmetic number, because the mean of its divisors is an integer number (39369265).

Almost surely, 2^163533861 is an apocalyptic number.

It is an amenable number.

163533861 is a deficient number, since it is larger than the sum of its proper divisors (72681729).

163533861 is a wasteful number, since it uses less digits than its factorization.

163533861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18170435 (or 18170432 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 163533861 is about 12788.0358538753. The cubic root of 163533861 is about 546.8512764283.

The spelling of 163533861 in words is "one hundred sixty-three million, five hundred thirty-three thousand, eight hundred sixty-one".