138878327009 has 2 divisors, whose sum is σ = 138878327010. Its totient is φ = 138878327008.

The previous prime is 138878326973. The next prime is 138878327033. The reversal of 138878327009 is 900723878831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135836473600 + 3041853409 = 368560^2 + 55153^2 .

It is a cyclic number.

It is not a de Polignac number, because 138878327009 - 2²⁰ = 138877278433 is a prime.

It is not a weakly prime, because it can be changed into another prime (138878317009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69439163504 + 69439163505.

It is an arithmetic number, because the mean of its divisors is an integer number (69439163505).

Almost surely, 2^138878327009 is an apocalyptic number.

It is an amenable number.

138878327009 is a deficient number, since it is larger than the sum of its proper divisors (1).

138878327009 is an equidigital number, since it uses as much as digits as its factorization.

138878327009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 138878327009 in words is "one hundred thirty-eight billion, eight hundred seventy-eight million, three hundred twenty-seven thousand, nine".