8438438421533 has 2 divisors, whose sum is σ = 8438438421534. Its totient is φ = 8438438421532.

The previous prime is 8438438421499. The next prime is 8438438421541. The reversal of 8438438421533 is 3351248348348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5825860797124 + 2612577624409 = 2413682^2 + 1616347^2 .

It is a cyclic number.

It is not a de Polignac number, because 8438438421533 - 2³⁴ = 8421258552349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8438438421733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4219219210766 + 4219219210767.

It is an arithmetic number, because the mean of its divisors is an integer number (4219219210767).

Almost surely, 2^{8438438421533} is an apocalyptic number.

It is an amenable number.

8438438421533 is a deficient number, since it is larger than the sum of its proper divisors (1).

8438438421533 is an equidigital number, since it uses as much as digits as its factorization.

8438438421533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26542080, while the sum is 56.

The spelling of 8438438421533 in words is "eight trillion, four hundred thirty-eight billion, four hundred thirty-eight million, four hundred twenty-one thousand, five hundred thirty-three".