138777512777 has 2 divisors, whose sum is σ = 138777512778. Its totient is φ = 138777512776.

The previous prime is 138777512771. The next prime is 138777512813. The reversal of 138777512777 is 777215777831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136651472896 + 2126039881 = 369664^2 + 46109^2 .

It is a cyclic number.

It is not a de Polignac number, because 138777512777 - 2²⁰ = 138776464201 is a prime.

It is not a weakly prime, because it can be changed into another prime (138777512771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69388756388 + 69388756389.

It is an arithmetic number, because the mean of its divisors is an integer number (69388756389).

Almost surely, 2^138777512777 is an apocalyptic number.

It is an amenable number.

138777512777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138777512777 is an equidigital number, since it uses as much as digits as its factorization.

138777512777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28235760, while the sum is 62.

The spelling of 138777512777 in words is "one hundred thirty-eight billion, seven hundred seventy-seven million, five hundred twelve thousand, seven hundred seventy-seven".