163841661 has 12 divisors (see below), whose sum is σ = 243056892. Its totient is φ = 106275456.

The previous prime is 163841647. The next prime is 163841683. The reversal of 163841661 is 166148361.

163841661 is a `hidden beast` number, since 1 + 638 + 4 + 16 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 136749636 + 27092025 = 11694^2 + 5205^2 .

It is not a de Polignac number, because 163841661 - 2⁹ = 163841149 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163841611) 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 11 ways as a sum of consecutive naturals, for example, 245676 + ... + 246341.

It is an arithmetic number, because the mean of its divisors is an integer number (20254741).

Almost surely, 2^163841661 is an apocalyptic number.

It is an amenable number.

163841661 is a deficient number, since it is larger than the sum of its proper divisors (79215231).

163841661 is a wasteful number, since it uses less digits than its factorization.

163841661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492060 (or 492057 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 163841661 is about 12800.0648826481. The cubic root of 163841661 is about 547.1941520644.

The spelling of 163841661 in words is "one hundred sixty-three million, eight hundred forty-one thousand, six hundred sixty-one".