138945134374889 has 2 divisors, whose sum is σ = 138945134374890. Its totient is φ = 138945134374888.

The previous prime is 138945134374853. The next prime is 138945134374903. The reversal of 138945134374889 is 988473431549831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107518649574400 + 31426484800489 = 10369120^2 + 5605933^2 .

It is an emirp because it is prime and its reverse (988473431549831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138945134374889 - 2⁴⁰ = 137845622747113 is a prime.

It is not a weakly prime, because it can be changed into another prime (138945134376889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69472567187444 + 69472567187445.

It is an arithmetic number, because the mean of its divisors is an integer number (69472567187445).

Almost surely, 2^{138945134374889} is an apocalyptic number.

It is an amenable number.

138945134374889 is a deficient number, since it is larger than the sum of its proper divisors (1).

138945134374889 is an equidigital number, since it uses as much as digits as its factorization.

138945134374889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2508226560, while the sum is 77.

The spelling of 138945134374889 in words is "one hundred thirty-eight trillion, nine hundred forty-five billion, one hundred thirty-four million, three hundred seventy-four thousand, eight hundred eighty-nine".