12523520557 has 2 divisors, whose sum is σ = 12523520558. Its totient is φ = 12523520556.

The previous prime is 12523520549. The next prime is 12523520591. The reversal of 12523520557 is 75502532521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9003352996 + 3520167561 = 94886^2 + 59331^2 .

It is a cyclic number.

It is not a de Polignac number, because 12523520557 - 2³ = 12523520549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12523520507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6261760278 + 6261760279.

It is an arithmetic number, because the mean of its divisors is an integer number (6261760279).

Almost surely, 2^12523520557 is an apocalyptic number.

It is an amenable number.

12523520557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12523520557 is an equidigital number, since it uses as much as digits as its factorization.

12523520557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 37.

The spelling of 12523520557 in words is "twelve billion, five hundred twenty-three million, five hundred twenty thousand, five hundred fifty-seven".