138670650819209 has 2 divisors, whose sum is σ = 138670650819210. Its totient is φ = 138670650819208.

The previous prime is 138670650819059. The next prime is 138670650819241. The reversal of 138670650819209 is 902918056076831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134416847693584 + 4253803125625 = 11593828^2 + 2062475^2 .

It is a cyclic number.

It is not a de Polignac number, because 138670650819209 - 2¹⁶ = 138670650753673 is a prime.

It is not a weakly prime, because it can be changed into another prime (138670650819299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69335325409604 + 69335325409605.

It is an arithmetic number, because the mean of its divisors is an integer number (69335325409605).

Almost surely, 2^{138670650819209} is an apocalyptic number.

It is an amenable number.

138670650819209 is a deficient number, since it is larger than the sum of its proper divisors (1).

138670650819209 is an equidigital number, since it uses as much as digits as its factorization.

138670650819209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 138670650819209 in words is "one hundred thirty-eight trillion, six hundred seventy billion, six hundred fifty million, eight hundred nineteen thousand, two hundred nine".