8843646465421 has 2 divisors, whose sum is σ = 8843646465422. Its totient is φ = 8843646465420.

The previous prime is 8843646465419. The next prime is 8843646465427. The reversal of 8843646465421 is 1245646463488.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6171304292521 + 2672342172900 = 2484211^2 + 1634730^2 .

It is a cyclic number.

It is not a de Polignac number, because 8843646465421 - 2¹ = 8843646465419 is a prime.

Together with 8843646465419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8843646465421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8843646465427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4421823232710 + 4421823232711.

It is an arithmetic number, because the mean of its divisors is an integer number (4421823232711).

Almost surely, 2^{8843646465421} is an apocalyptic number.

It is an amenable number.

8843646465421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8843646465421 is an equidigital number, since it uses as much as digits as its factorization.

8843646465421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 106168320, while the sum is 61.

The spelling of 8843646465421 in words is "eight trillion, eight hundred forty-three billion, six hundred forty-six million, four hundred sixty-five thousand, four hundred twenty-one".