138147989544557 has 2 divisors, whose sum is σ = 138147989544558. Its totient is φ = 138147989544556.

The previous prime is 138147989544491. The next prime is 138147989544611. The reversal of 138147989544557 is 755445989741831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138147724147876 + 265396681 = 11753626^2 + 16291^2 .

It is a cyclic number.

It is not a de Polignac number, because 138147989544557 - 2¹⁶ = 138147989479021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138147989544457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69073994772278 + 69073994772279.

It is an arithmetic number, because the mean of its divisors is an integer number (69073994772279).

Almost surely, 2^{138147989544557} is an apocalyptic number.

It is an amenable number.

138147989544557 is a deficient number, since it is larger than the sum of its proper divisors (1).

138147989544557 is an equidigital number, since it uses as much as digits as its factorization.

138147989544557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384000, while the sum is 80.

The spelling of 138147989544557 in words is "one hundred thirty-eight trillion, one hundred forty-seven billion, nine hundred eighty-nine million, five hundred forty-four thousand, five hundred fifty-seven".