138679799677 has 2 divisors, whose sum is σ = 138679799678. Its totient is φ = 138679799676.

The previous prime is 138679799669. The next prime is 138679799681. The reversal of 138679799677 is 776997976831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128860178841 + 9819620836 = 358971^2 + 99094^2 .

It is a cyclic number.

It is not a de Polignac number, because 138679799677 - 2³ = 138679799669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138679799597 and 138679799606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138679790677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69339899838 + 69339899839.

It is an arithmetic number, because the mean of its divisors is an integer number (69339899839).

Almost surely, 2^138679799677 is an apocalyptic number.

It is an amenable number.

138679799677 is a deficient number, since it is larger than the sum of its proper divisors (1).

138679799677 is an equidigital number, since it uses as much as digits as its factorization.

138679799677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512284256, while the sum is 79.

The spelling of 138679799677 in words is "one hundred thirty-eight billion, six hundred seventy-nine million, seven hundred ninety-nine thousand, six hundred seventy-seven".