138618885075817 has 2 divisors, whose sum is σ = 138618885075818. Its totient is φ = 138618885075816.

The previous prime is 138618885075691. The next prime is 138618885075841. The reversal of 138618885075817 is 718570588816831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83283675228121 + 55335209847696 = 9125989^2 + 7438764^2 .

It is a cyclic number.

It is not a de Polignac number, because 138618885075817 - 2¹⁵ = 138618885043049 is a prime.

It is a super-2 number, since 2×138618885075817² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138618885075887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69309442537908 + 69309442537909.

It is an arithmetic number, because the mean of its divisors is an integer number (69309442537909).

Almost surely, 2^{138618885075817} is an apocalyptic number.

It is an amenable number.

138618885075817 is a deficient number, since it is larger than the sum of its proper divisors (1).

138618885075817 is an equidigital number, since it uses as much as digits as its factorization.

138618885075817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 722534400, while the sum is 76.

The spelling of 138618885075817 in words is "one hundred thirty-eight trillion, six hundred eighteen billion, eight hundred eighty-five million, seventy-five thousand, eight hundred seventeen".