138647746877 has 2 divisors, whose sum is σ = 138647746878. Its totient is φ = 138647746876.

The previous prime is 138647746807. The next prime is 138647746921. The reversal of 138647746877 is 778647746831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72778011076 + 65869735801 = 269774^2 + 256651^2 .

It is a cyclic number.

It is not a de Polignac number, because 138647746877 - 2¹⁰ = 138647745853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138647746807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69323873438 + 69323873439.

It is an arithmetic number, because the mean of its divisors is an integer number (69323873439).

Almost surely, 2^138647746877 is an apocalyptic number.

It is an amenable number.

138647746877 is a deficient number, since it is larger than the sum of its proper divisors (1).

138647746877 is an equidigital number, since it uses as much as digits as its factorization.

138647746877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 265531392, while the sum is 68.

The spelling of 138647746877 in words is "one hundred thirty-eight billion, six hundred forty-seven million, seven hundred forty-six thousand, eight hundred seventy-seven".