163788561 has 24 divisors (see below), whose sum is σ = 250583424. Its totient is φ = 106861680.

The previous prime is 163788533. The next prime is 163788571. The reversal of 163788561 is 165887361.

163788561 is a `hidden beast` number, since 1 + 6 + 3 + 7 + 88 + 561 = 666.

It is not a de Polignac number, because 163788561 - 2¹⁴ = 163772177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163788571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4251 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (10440976).

Almost surely, 2^163788561 is an apocalyptic number.

It is an amenable number.

163788561 is a deficient number, since it is larger than the sum of its proper divisors (86794863).

163788561 is an equidigital number, since it uses as much as digits as its factorization.

163788561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403 (or 14391 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 163788561 is about 12797.9905063256. The cubic root of 163788561 is about 547.1350316738.

The spelling of 163788561 in words is "one hundred sixty-three million, seven hundred eighty-eight thousand, five hundred sixty-one".