138281861639 has 2 divisors, whose sum is σ = 138281861640. Its totient is φ = 138281861638.

The previous prime is 138281861633. The next prime is 138281861651. The reversal of 138281861639 is 936168182831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138281861639 - 2⁸ = 138281861383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138281861633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69140930819 + 69140930820.

It is an arithmetic number, because the mean of its divisors is an integer number (69140930820).

Almost surely, 2^138281861639 is an apocalyptic number.

138281861639 is a deficient number, since it is larger than the sum of its proper divisors (1).

138281861639 is an equidigital number, since it uses as much as digits as its factorization.

138281861639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 56.

The spelling of 138281861639 in words is "one hundred thirty-eight billion, two hundred eighty-one million, eight hundred sixty-one thousand, six hundred thirty-nine".