138147868393 has 2 divisors, whose sum is σ = 138147868394. Its totient is φ = 138147868392.

The previous prime is 138147868373. The next prime is 138147868409. The reversal of 138147868393 is 393868741831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99699325504 + 38448542889 = 315752^2 + 196083^2 .

It is a cyclic number.

It is not a de Polignac number, because 138147868393 - 2⁹ = 138147867881 is a prime.

It is not a weakly prime, because it can be changed into another prime (138147868363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69073934196 + 69073934197.

It is an arithmetic number, because the mean of its divisors is an integer number (69073934197).

Almost surely, 2^138147868393 is an apocalyptic number.

It is an amenable number.

138147868393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138147868393 is an equidigital number, since it uses as much as digits as its factorization.

138147868393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 61.

The spelling of 138147868393 in words is "one hundred thirty-eight billion, one hundred forty-seven million, eight hundred sixty-eight thousand, three hundred ninety-three".