163634661 has 10 divisors (see below), whose sum is σ = 244442022. Its totient is φ = 109089720.

The previous prime is 163634641. The next prime is 163634677. The reversal of 163634661 is 166436361.

163634661 is a `hidden beast` number, since 16 + 3 + 634 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 162180225 + 1454436 = 12735^2 + 1206^2 .

It is not a de Polignac number, because 163634661 - 2⁵ = 163634629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163634641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1010010 + ... + 1010171.

Almost surely, 2^163634661 is an apocalyptic number.

It is an amenable number.

163634661 is a deficient number, since it is larger than the sum of its proper divisors (80807361).

163634661 is an equidigital number, since it uses as much as digits as its factorization.

163634661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020193 (or 2020184 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 163634661 is about 12791.9764305599. The cubic root of 163634661 is about 546.9636105276.

The spelling of 163634661 in words is "one hundred sixty-three million, six hundred thirty-four thousand, six hundred sixty-one".