138635662877 has 2 divisors, whose sum is σ = 138635662878. Its totient is φ = 138635662876.

The previous prime is 138635662873. The next prime is 138635662883. The reversal of 138635662877 is 778266536831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138427899481 + 207763396 = 372059^2 + 14414^2 .

It is a cyclic number.

It is not a de Polignac number, because 138635662877 - 2² = 138635662873 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138635662873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69317831438 + 69317831439.

It is an arithmetic number, because the mean of its divisors is an integer number (69317831439).

Almost surely, 2^138635662877 is an apocalyptic number.

It is an amenable number.

138635662877 is a deficient number, since it is larger than the sum of its proper divisors (1).

138635662877 is an equidigital number, since it uses as much as digits as its factorization.

138635662877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60963840, while the sum is 62.

The spelling of 138635662877 in words is "one hundred thirty-eight billion, six hundred thirty-five million, six hundred sixty-two thousand, eight hundred seventy-seven".