12655503521 has 2 divisors, whose sum is σ = 12655503522. Its totient is φ = 12655503520.

The previous prime is 12655503503. The next prime is 12655503577. The reversal of 12655503521 is 12530555621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12220197025 + 435306496 = 110545^2 + 20864^2 .

It is an emirp because it is prime and its reverse (12530555621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12655503521 - 2¹⁴ = 12655487137 is a prime.

It is not a weakly prime, because it can be changed into another prime (12655503121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327751760 + 6327751761.

It is an arithmetic number, because the mean of its divisors is an integer number (6327751761).

Almost surely, 2^12655503521 is an apocalyptic number.

It is an amenable number.

12655503521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655503521 is an equidigital number, since it uses as much as digits as its factorization.

12655503521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 12655503521 in words is "twelve billion, six hundred fifty-five million, five hundred three thousand, five hundred twenty-one".