163554561 has 6 divisors (see below), whose sum is σ = 236245490. Its totient is φ = 109036368.

The previous prime is 163554553. The next prime is 163554581. The reversal of 163554561 is 165455361.

163554561 is a `hidden beast` number, since 16 + 35 + 54 + 561 = 666.

163554561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 118396161 + 45158400 = 10881^2 + 6720^2 .

It is not a de Polignac number, because 163554561 - 2³ = 163554553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163554511) 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, 9086356 + ... + 9086373.

Almost surely, 2^163554561 is an apocalyptic number.

It is an amenable number.

163554561 is a deficient number, since it is larger than the sum of its proper divisors (72690929).

163554561 is a wasteful number, since it uses less digits than its factorization.

163554561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18172735 (or 18172732 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 163554561 is about 12788.8451785140. The cubic root of 163554561 is about 546.8743488036.

The spelling of 163554561 in words is "one hundred sixty-three million, five hundred fifty-four thousand, five hundred sixty-one".