163564661 has 16 divisors (see below), whose sum is σ = 184550016. Its totient is φ = 143833536.

The previous prime is 163564657. The next prime is 163564717. The reversal of 163564661 is 166465361.

It is not a de Polignac number, because 163564661 - 2² = 163564657 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163564631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83651 + ... + 85583.

It is an arithmetic number, because the mean of its divisors is an integer number (11534376).

Almost surely, 2^163564661 is an apocalyptic number.

It is an amenable number.

163564661 is a deficient number, since it is larger than the sum of its proper divisors (20985355).

163564661 is a wasteful number, since it uses less digits than its factorization.

163564661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252.

The product of its digits is 77760, while the sum is 38.

The square root of 163564661 is about 12789.2400477902. The cubic root of 163564661 is about 546.8856056327.

The spelling of 163564661 in words is "one hundred sixty-three million, five hundred sixty-four thousand, six hundred sixty-one".