8138326969081 has 2 divisors, whose sum is σ = 8138326969082. Its totient is φ = 8138326969080.

The previous prime is 8138326969009. The next prime is 8138326969099. The reversal of 8138326969081 is 1809696238318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7426524277225 + 711802691856 = 2725165^2 + 843684^2 .

It is a cyclic number.

It is not a de Polignac number, because 8138326969081 - 2¹⁹ = 8138326444793 is a prime.

It is a super-2 number, since 2×8138326969081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8138326919081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069163484540 + 4069163484541.

It is an arithmetic number, because the mean of its divisors is an integer number (4069163484541).

Almost surely, 2^{8138326969081} is an apocalyptic number.

It is an amenable number.

8138326969081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8138326969081 is an equidigital number, since it uses as much as digits as its factorization.

8138326969081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 64.

The spelling of 8138326969081 in words is "eight trillion, one hundred thirty-eight billion, three hundred twenty-six million, nine hundred sixty-nine thousand, eighty-one".