38816566611421 has 2 divisors, whose sum is σ = 38816566611422. Its totient is φ = 38816566611420.

The previous prime is 38816566611419. The next prime is 38816566611479. The reversal of 38816566611421 is 12411666561883.

It is an a-pointer prime, because the next prime (38816566611479) can be obtained adding 38816566611421 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27440719315321 + 11375847296100 = 5238389^2 + 3372810^2 .

It is a cyclic number.

It is not a de Polignac number, because 38816566611421 - 2¹ = 38816566611419 is a prime.

Together with 38816566611419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38816566611401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19408283305710 + 19408283305711.

It is an arithmetic number, because the mean of its divisors is an integer number (19408283305711).

Almost surely, 2^{38816566611421} is an apocalyptic number.

It is an amenable number.

38816566611421 is a deficient number, since it is larger than the sum of its proper divisors (1).

38816566611421 is an equidigital number, since it uses as much as digits as its factorization.

38816566611421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 58.

The spelling of 38816566611421 in words is "thirty-eight trillion, eight hundred sixteen billion, five hundred sixty-six million, six hundred eleven thousand, four hundred twenty-one".