138918017671 has 2 divisors, whose sum is σ = 138918017672. Its totient is φ = 138918017670.

The previous prime is 138918017663. The next prime is 138918017677. The reversal of 138918017671 is 176710819831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138918017671 - 2³ = 138918017663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138918017677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69459008835 + 69459008836.

It is an arithmetic number, because the mean of its divisors is an integer number (69459008836).

Almost surely, 2^138918017671 is an apocalyptic number.

138918017671 is a deficient number, since it is larger than the sum of its proper divisors (1).

138918017671 is an equidigital number, since it uses as much as digits as its factorization.

138918017671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 52.

The spelling of 138918017671 in words is "one hundred thirty-eight billion, nine hundred eighteen million, seventeen thousand, six hundred seventy-one".