138877481864477 has 2 divisors, whose sum is σ = 138877481864478. Its totient is φ = 138877481864476.

The previous prime is 138877481864419. The next prime is 138877481864509. The reversal of 138877481864477 is 774468184778831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138877480667641 + 1196836 = 11784629^2 + 1094^2 .

It is an emirp because it is prime and its reverse (774468184778831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138877481864477 - 2²⁴ = 138877465087261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138877481864395 and 138877481864404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138877484864477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69438740932238 + 69438740932239.

It is an arithmetic number, because the mean of its divisors is an integer number (69438740932239).

Almost surely, 2^{138877481864477} is an apocalyptic number.

It is an amenable number.

138877481864477 is a deficient number, since it is larger than the sum of its proper divisors (1).

138877481864477 is an equidigital number, since it uses as much as digits as its factorization.

138877481864477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11329339392, while the sum is 83.

The spelling of 138877481864477 in words is "one hundred thirty-eight trillion, eight hundred seventy-seven billion, four hundred eighty-one million, eight hundred sixty-four thousand, four hundred seventy-seven".