138666739927 has 2 divisors, whose sum is σ = 138666739928. Its totient is φ = 138666739926.

The previous prime is 138666739921. The next prime is 138666739961. The reversal of 138666739927 is 729937666831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138666739927 - 2³⁵ = 104307001559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138666739921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69333369963 + 69333369964.

It is an arithmetic number, because the mean of its divisors is an integer number (69333369964).

Almost surely, 2^138666739927 is an apocalyptic number.

138666739927 is a deficient number, since it is larger than the sum of its proper divisors (1).

138666739927 is an equidigital number, since it uses as much as digits as its factorization.

138666739927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123451776, while the sum is 67.

The spelling of 138666739927 in words is "one hundred thirty-eight billion, six hundred sixty-six million, seven hundred thirty-nine thousand, nine hundred twenty-seven".