8443121738689 has 12 divisors (see below), whose sum is σ = 9292715746132. Its totient is φ = 7665425681760.

The previous prime is 8443121738629. The next prime is 8443121738713. The reversal of 8443121738689 is 9868371213448.

It can be written as a sum of positive squares in 2 ways, for example, as 5491968815025 + 2951152923664 = 2343495^2 + 1717892^2 .

It is not a de Polignac number, because 8443121738689 - 2¹⁹ = 8443121214401 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8443121738689.

It is not an unprimeable number, because it can be changed into a prime (8443121738629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45996822 + ... + 46180015.

Almost surely, 2^{8443121738689} is an apocalyptic number.

It is an amenable number.

8443121738689 is a deficient number, since it is larger than the sum of its proper divisors (849594007443).

8443121738689 is a wasteful number, since it uses less digits than its factorization.

8443121738689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92177616 (or 92177605 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 64.

The spelling of 8443121738689 in words is "eight trillion, four hundred forty-three billion, one hundred twenty-one million, seven hundred thirty-eight thousand, six hundred eighty-nine".