1938663049129 has 2 divisors, whose sum is σ = 1938663049130. Its totient is φ = 1938663049128.

The previous prime is 1938663049093. The next prime is 1938663049157. The reversal of 1938663049129 is 9219403668391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060131759129 + 878531290000 = 1029627^2 + 937300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938663049129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938663049229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969331524564 + 969331524565.

It is an arithmetic number, because the mean of its divisors is an integer number (969331524565).

Almost surely, 2^{1938663049129} is an apocalyptic number.

It is an amenable number.

1938663049129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938663049129 is an equidigital number, since it uses as much as digits as its factorization.

1938663049129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15116544, while the sum is 61.

The spelling of 1938663049129 in words is "one trillion, nine hundred thirty-eight billion, six hundred sixty-three million, forty-nine thousand, one hundred twenty-nine".