138461645477 has 2 divisors, whose sum is σ = 138461645478. Its totient is φ = 138461645476.

The previous prime is 138461645473. The next prime is 138461645549. The reversal of 138461645477 is 774546164831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72622704196 + 65838941281 = 269486^2 + 256591^2 .

It is a cyclic number.

It is not a de Polignac number, because 138461645477 - 2² = 138461645473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138461645473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69230822738 + 69230822739.

It is an arithmetic number, because the mean of its divisors is an integer number (69230822739).

Almost surely, 2^138461645477 is an apocalyptic number.

It is an amenable number.

138461645477 is a deficient number, since it is larger than the sum of its proper divisors (1).

138461645477 is an equidigital number, since it uses as much as digits as its factorization.

138461645477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13547520, while the sum is 56.

The spelling of 138461645477 in words is "one hundred thirty-eight billion, four hundred sixty-one million, six hundred forty-five thousand, four hundred seventy-seven".