138880172777 has 2 divisors, whose sum is σ = 138880172778. Its totient is φ = 138880172776.

The previous prime is 138880172729. The next prime is 138880172789. The reversal of 138880172777 is 777271088831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138872494336 + 7678441 = 372656^2 + 2771^2 .

It is a cyclic number.

It is not a de Polignac number, because 138880172777 - 2¹⁰ = 138880171753 is a prime.

It is not a weakly prime, because it can be changed into another prime (138880132777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69440086388 + 69440086389.

It is an arithmetic number, because the mean of its divisors is an integer number (69440086389).

Almost surely, 2^138880172777 is an apocalyptic number.

It is an amenable number.

138880172777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138880172777 is an equidigital number, since it uses as much as digits as its factorization.

138880172777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7375872, while the sum is 59.

The spelling of 138880172777 in words is "one hundred thirty-eight billion, eight hundred eighty million, one hundred seventy-two thousand, seven hundred seventy-seven".