38778581329 has 2 divisors, whose sum is σ = 38778581330. Its totient is φ = 38778581328.

The previous prime is 38778581327. The next prime is 38778581383. The reversal of 38778581329 is 92318587783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32932449729 + 5846131600 = 181473^2 + 76460^2 .

It is an emirp because it is prime and its reverse (92318587783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38778581329 - 2¹ = 38778581327 is a prime.

Together with 38778581327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38778581327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19389290664 + 19389290665.

It is an arithmetic number, because the mean of its divisors is an integer number (19389290665).

Almost surely, 2^38778581329 is an apocalyptic number.

It is an amenable number.

38778581329 is a deficient number, since it is larger than the sum of its proper divisors (1).

38778581329 is an equidigital number, since it uses as much as digits as its factorization.

38778581329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 61.

The spelling of 38778581329 in words is "thirty-eight billion, seven hundred seventy-eight million, five hundred eighty-one thousand, three hundred twenty-nine".