138375660881 has 2 divisors, whose sum is σ = 138375660882. Its totient is φ = 138375660880.

The previous prime is 138375660853. The next prime is 138375660887. The reversal of 138375660881 is 188066573831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124354969600 + 14020691281 = 352640^2 + 118409^2 .

It is a cyclic number.

It is not a de Polignac number, because 138375660881 - 2¹⁴ = 138375644497 is a prime.

It is a super-2 number, since 2×138375660881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138375660887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69187830440 + 69187830441.

It is an arithmetic number, because the mean of its divisors is an integer number (69187830441).

Almost surely, 2^138375660881 is an apocalyptic number.

It is an amenable number.

138375660881 is a deficient number, since it is larger than the sum of its proper divisors (1).

138375660881 is an equidigital number, since it uses as much as digits as its factorization.

138375660881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 138375660881 in words is "one hundred thirty-eight billion, three hundred seventy-five million, six hundred sixty thousand, eight hundred eighty-one".