163677681 has 12 divisors (see below), whose sum is σ = 237931252. Its totient is φ = 108422496.

The previous prime is 163677673. The next prime is 163677691. The reversal of 163677681 is 186776361.

163677681 is a `hidden beast` number, since 1 + 636 + 7 + 7 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54997056 + 108680625 = 7416^2 + 10425^2 .

It is not a de Polignac number, because 163677681 - 2³ = 163677673 is a prime.

It is a super-2 number, since 2×163677681² = 53580766515075522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163677601) 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, 56506 + ... + 59331.

Almost surely, 2^163677681 is an apocalyptic number.

It is an amenable number.

163677681 is a deficient number, since it is larger than the sum of its proper divisors (74253571).

163677681 is a wasteful number, since it uses less digits than its factorization.

163677681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116000 (or 115997 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 163677681 is about 12793.6578428532. The cubic root of 163677681 is about 547.0115390708.

The spelling of 163677681 in words is "one hundred sixty-three million, six hundred seventy-seven thousand, six hundred eighty-one".