2128673663 has 4 divisors (see below), whose sum is σ = 2173964640. Its totient is φ = 2083382688.

The previous prime is 2128673647. The next prime is 2128673671. The reversal of 2128673663 is 3663768212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2128673663 - 2⁴ = 2128673647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128673623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22645418 + ... + 22645511.

It is an arithmetic number, because the mean of its divisors is an integer number (543491160).

Almost surely, 2^2128673663 is an apocalyptic number.

2128673663 is a deficient number, since it is larger than the sum of its proper divisors (45290977).

2128673663 is an equidigital number, since it uses as much as digits as its factorization.

2128673663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45290976.

The product of its digits is 435456, while the sum is 44.

The square root of 2128673663 is about 46137.5515496867. The cubic root of 2128673663 is about 1286.3812332814.

It can be divided in two parts, 21286 and 73663, that added together give a palindrome (94949).

The spelling of 2128673663 in words is "two billion, one hundred twenty-eight million, six hundred seventy-three thousand, six hundred sixty-three".