12138944533 has 2 divisors, whose sum is σ = 12138944534. Its totient is φ = 12138944532.

The previous prime is 12138944513. The next prime is 12138944603. The reversal of 12138944533 is 33544983121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11776156324 + 362788209 = 108518^2 + 19047^2 .

It is a cyclic number.

It is not a de Polignac number, because 12138944533 - 2⁹ = 12138944021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12138944533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12138944513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069472266 + 6069472267.

It is an arithmetic number, because the mean of its divisors is an integer number (6069472267).

Almost surely, 2^12138944533 is an apocalyptic number.

It is an amenable number.

12138944533 is a deficient number, since it is larger than the sum of its proper divisors (1).

12138944533 is an equidigital number, since it uses as much as digits as its factorization.

12138944533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 43.

The spelling of 12138944533 in words is "twelve billion, one hundred thirty-eight million, nine hundred forty-four thousand, five hundred thirty-three".