138669762779 has 2 divisors, whose sum is σ = 138669762780. Its totient is φ = 138669762778.

The previous prime is 138669762767. The next prime is 138669762797. The reversal of 138669762779 is 977267966831.

Together with next prime (138669762797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138669762779 - 2¹² = 138669758683 is a prime.

It is not a weakly prime, because it can be changed into another prime (138669762709) 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, 69334881389 + 69334881390.

It is an arithmetic number, because the mean of its divisors is an integer number (69334881390).

Almost surely, 2^138669762779 is an apocalyptic number.

138669762779 is a deficient number, since it is larger than the sum of its proper divisors (1).

138669762779 is an equidigital number, since it uses as much as digits as its factorization.

138669762779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288054144, while the sum is 71.

The spelling of 138669762779 in words is "one hundred thirty-eight billion, six hundred sixty-nine million, seven hundred sixty-two thousand, seven hundred seventy-nine".