12536544557 has 2 divisors, whose sum is σ = 12536544558. Its totient is φ = 12536544556.

The previous prime is 12536544487. The next prime is 12536544619. The reversal of 12536544557 is 75544563521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11444506441 + 1092038116 = 106979^2 + 33046^2 .

It is a cyclic number.

It is not a de Polignac number, because 12536544557 - 2¹⁰ = 12536543533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12536544257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6268272278 + 6268272279.

It is an arithmetic number, because the mean of its divisors is an integer number (6268272279).

Almost surely, 2^12536544557 is an apocalyptic number.

It is an amenable number.

12536544557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12536544557 is an equidigital number, since it uses as much as digits as its factorization.

12536544557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520000, while the sum is 47.

The spelling of 12536544557 in words is "twelve billion, five hundred thirty-six million, five hundred forty-four thousand, five hundred fifty-seven".