138681650039 has 2 divisors, whose sum is σ = 138681650040. Its totient is φ = 138681650038.

The previous prime is 138681649979. The next prime is 138681650087. The reversal of 138681650039 is 930056186831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138681650039 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138681650089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69340825019 + 69340825020.

It is an arithmetic number, because the mean of its divisors is an integer number (69340825020).

Almost surely, 2^138681650039 is an apocalyptic number.

138681650039 is a deficient number, since it is larger than the sum of its proper divisors (1).

138681650039 is an equidigital number, since it uses as much as digits as its factorization.

138681650039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 138681650039 in words is "one hundred thirty-eight billion, six hundred eighty-one million, six hundred fifty thousand, thirty-nine".