16643631163 has 4 divisors (see below), whose sum is σ = 16643906200. Its totient is φ = 16643356128.

The previous prime is 16643631157. The next prime is 16643631167. The reversal of 16643631163 is 36113634661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36113634661 = 13 ⋅2777971897.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16643631163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16643631167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2670 + ... + 182467.

It is an arithmetic number, because the mean of its divisors is an integer number (4160976550).

Almost surely, 2^16643631163 is an apocalyptic number.

16643631163 is a deficient number, since it is larger than the sum of its proper divisors (275037).

16643631163 is an equidigital number, since it uses as much as digits as its factorization.

16643631163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275036.

The product of its digits is 139968, while the sum is 40.

The spelling of 16643631163 in words is "sixteen billion, six hundred forty-three million, six hundred thirty-one thousand, one hundred sixty-three".