138236442677 has 2 divisors, whose sum is σ = 138236442678. Its totient is φ = 138236442676.

The previous prime is 138236442661. The next prime is 138236442679. The reversal of 138236442677 is 776244632831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129235936036 + 9000506641 = 359494^2 + 94871^2 .

It is a cyclic number.

It is not a de Polignac number, because 138236442677 - 2⁴ = 138236442661 is a prime.

Together with 138236442679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138236442679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69118221338 + 69118221339.

It is an arithmetic number, because the mean of its divisors is an integer number (69118221339).

Almost surely, 2^138236442677 is an apocalyptic number.

It is an amenable number.

138236442677 is a deficient number, since it is larger than the sum of its proper divisors (1).

138236442677 is an equidigital number, since it uses as much as digits as its factorization.

138236442677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 53.

The spelling of 138236442677 in words is "one hundred thirty-eight billion, two hundred thirty-six million, four hundred forty-two thousand, six hundred seventy-seven".