12661302529 has 2 divisors, whose sum is σ = 12661302530. Its totient is φ = 12661302528.

The previous prime is 12661302481. The next prime is 12661302541. The reversal of 12661302529 is 92520316621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9944078400 + 2717224129 = 99720^2 + 52127^2 .

It is a cyclic number.

It is not a de Polignac number, because 12661302529 - 2¹¹ = 12661300481 is a prime.

It is not a weakly prime, because it can be changed into another prime (12661302569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330651264 + 6330651265.

It is an arithmetic number, because the mean of its divisors is an integer number (6330651265).

Almost surely, 2^12661302529 is an apocalyptic number.

It is an amenable number.

12661302529 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661302529 is an equidigital number, since it uses as much as digits as its factorization.

12661302529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 12661302529 in words is "twelve billion, six hundred sixty-one million, three hundred two thousand, five hundred twenty-nine".